Gen. 5:24, Heb. 11:5 - Enoch was bodily assumed into heaven without dying. Would God do any less for Mary the Ark of the New Covenant?
2 Kings 2:11-12; 1 Mac 2:58 - Elijah was assumed into heaven in fiery chariot. Jesus would not do any less for His Blessed Mother.
Psalm 132:8 - Arise, O Lord, and go to thy resting place, thou and the Ark (Mary) of thy might. Both Jesus and Mary were taken up to their eternal resting place in heaven.
2 Cor. 12:2 - Paul speaks of a man in Christ who was caught up to the third heaven. Mary was also brought up into heaven by God.
Matt. 27:52-53 - when Jesus died and rose, the bodies of the saints were raised. Nothing in Scripture precludes Mary's assumption into heaven.
1 Thess. 4:17 - we shall be caught up in the clouds to meet the Lord in the air and so we shall always be with the Lord.
Rev. 12:1 - we see Mary, the "woman," clothed with the sun. While in Rev. 6:9 we only see the souls of the martyrs in heaven, in Rev. 12:1 we see Mary, both body and soul.
2 Thess. 2:15 - Paul instructs us to hold fast to oral (not just written) tradition. Apostolic tradition says Mary was assumed into heaven. While claiming the bones of the saints was a common practice during these times (and would have been especially important to obtain Mary's bones as she was the Mother of God), Mary's bones were never claimed. This is because they were not available. Mary was taken up body and soul into heaven.
“If the Holy Virgin had died and was buried, her falling asleep would have been surrounded with honour, death would have found her pure, and her crown would have been a virginal one...Had she been martyred according to what is written: 'Thine own soul a sword shall pierce', then she would shine gloriously among the martyrs, and her holy body would have been declared blessed; for by her, did light come to the world."
Epiphanius, Panarion, 78:23 (A.D. 377).
"[T]he Apostles took up her body on a bier and placed it in a tomb; and they guarded it, expecting the Lord to come. And behold, again the Lord stood by them; and the holy body having been received, He commanded that it be taken in a cloud into paradise: where now, rejoined to the soul, [Mary] rejoices with the Lord's chosen ones..." Gregory of Tours, Eight Books of Miracles, 1:4 (inter A.D. 575-593).
"As the most glorious Mother of Christ, our Savior and God and the giver of life and immortality, has been endowed with life by him, she has received an eternal incorruptibility of the body together with him who has raised her up from the tomb and has taken her up to himself in a way known only to him." Modestus of Jerusalem, Encomium in dormitionnem Sanctissimae Dominae nostrae Deiparae semperque Virginis Mariae (PG 86-II,3306),(ante A.D. 634).
"It was fitting ...that the most holy-body of Mary, God-bearing body, receptacle of God, divinised, incorruptible, illuminated by divine grace and full glory ...should be entrusted to the earth for a little while and raised up to heaven in glory, with her soul pleasing to God." Theoteknos of Livias, Homily on the Assumption (ante A.D. 650).
"You are she who, as it is written, appears in beauty, and your virginal body is all holy, all chaste, entirely the dwelling place of God, so that it is henceforth completely exempt from dissolution into dust. Though still human, it is changed into the heavenly life of incorruptibility, truly living and glorious, undamaged and sharing in perfect life." Germanus of Constantinople, Sermon I (PG 98,346), (ante A.D. 733).
"St. Juvenal, Bishop of Jerusalem, at the Council of Chalcedon (451), made known to the Emperor Marcian and Pulcheria, who wished to possess the body of the Mother of God, that Mary died in the presence of all the Apostles, but that her tomb, when opened upon the request of St. Thomas, was found empty; wherefrom the Apostles concluded that the body was taken up to heaven." John of Damascene, PG (96:1) (A.D. 747-751).
"It was fitting that the she, who had kept her virginity intact in childbirth, should keep her own body free from all corruption even after death. It was fitting that she, who had carried the Creator as a child at her breast, should dwell in the divine tabernacles. It was fitting that the spouse, whom the Father had taken to himself, should live in the divine mansions. It was fitting that she, who had seen her Son upon the cross and who had thereby received into her heart the sword of sorrow which she had escaped when giving birth to him, should look upon him as he sits with the Father, It was fitting that God's Mother should possess what belongs to her Son, and that she should be honored by every creature as the Mother and as the handmaid of God." John of Damascene, Dormition of Mary (PG 96,741), (ante A.D. 749).
"Venerable to us, O Lord, is the festivity of this day on which the holy Mother of God suffered temporal death, but still could not be kept down by the bonds of death, who has begotten Thy Son our Lord incarnate from herself." Gregorian Sacramentary, Veneranda (ante A.D. 795).
"[A]n effable mystery all the more worthy of praise as the Virgin's Assumption is something unique among men." Gallican Sacramentary, from Munificentis simus Deus (8th Century).
"God, the King of the universe, has granted you favors that surpass nature. As he kept you virgin in childbirth, thus he kept your body incorrupt in the tomb and has glorified it by his divine act of transferring it from the tomb." Byzantine Liturgy, from Munificentis simus Deus (8th Century).
"[T]he virgin is up to now immortal, as He who lived, translated her into the place of reception." Timotheus of Jerusalem (8th Century).