When you enter some of the greatest cities in the world, you can encounter famous gates such as the Brandenburg Gate (Berlin), the Jaffa Gate (Jerusalem), and the gates at Downing Street (London). Whether the gates were built for defensive or ceremonial purposes, they all represent the difference between being outside or inside certain areas of the city. Some are open; some are closed to all but a few.
The gates into the presence of God are always open. The familiar song of Psalm 100 is an invitation for the Israelites to enter into the presence of God through the temple gates. They were told to shout for joy and come before him with joyful songs (vv. 12). Shouting for joy was an appropriate expression when greeting a monarch in the ancient world. All the earth was to sing joyfully about God! The reason for this joyful noise was that God had given them their identity (v. 3). They entered the gates with praise and thanksgiving because of Gods goodness and His steadfast and enduring love which continues through all generations (vv. 45). Even when they forgot their identity and wandered away from Him, God remained faithful and still invited them to enter His presence.
The gates into Gods presence are still open, inviting us to come and worship.
Psalm 100 is poetry packed with image-rich language. When the psalmist says we are the Lords, this reminds us of His creative and redeeming work. The Bible tells us that if we have faith in Christ, we are His in at least two ways: We are His because He created us (Gen. 1:2631) and because He has adopted us as His family (Eph. 1:5). The psalmist also uses the image of a sheep. We are the sheep of His pasture. We belong to Him and can enter His gates because we are under His care. Jesus Himself uses this image of sheep and gates in John 10:79 when explaining what it means to be saved.