Fine is the Assumption of mary scriptural!
Sorry, no it is not per se "scriptural" but it is Catholic dogma. BTW, the Catholic Church is solely responsible for scripture as we know it today. Without the Church there would be no scripture. The early chruch recorded the words of Christ and preserved them through both oral testemony and by writting the words down in the later years. Anything that becomes Catholic dogma has been very throughly reserched and documented. The Church does not do anything without both.