Let me ask you…why would the Catholic Church declare dogma something that does not have a basis from Sacred Tradition?
ewtn.com/library/papaldoc/p12munif.htm
These studies and investigations have brought out into even clearer light the fact that the dogma of the Virgin Mary’s Assumption into heaven is contained in the deposit of Christian faith entrusted to the Church.
- However, since the liturgy of the Church does not engender the Catholic faith, but rather springs from it, in such a way that the practices of the sacred worship proceed from the faith as the fruit comes from the tree, it follows that the holy Fathers and the great Doctors, in the homilies and sermons they gave the people on this feast day, did not draw their teaching from the feast itself as from a primary source, but rather they spoke of this doctrine as something already known and accepted by Christ’s faithful. They presented it more clearly. They offered more profound explanations of its meaning and nature, bringing out into sharper light the fact that this feast shows, not only that the dead body of the Blessed Virgin Mary remained incorrupt, but that she gained a triumph out of death, her heavenly glorification after the example of her only begotten Son, Jesus Christ-truths that the liturgical books had frequently touched upon concisely and briefly.
Liturgical evidence for the assumption of St. Mary is definitely worth investigating–it doesn’t come up very much in discussions of early Christian theology.
One interesting scriptural reference I have seen for this Catholic dogma and Eastern/Oriental Orthodox doctrine is found in Psalm 132 (emphasis added):
[1] Remember, O LORD, in David’s favor,
all the hardships he endured;
[2] how he swore to the LORD
and vowed to the Mighty One of Jacob,
[3] “I will not enter my house
or get into my bed;
[4] I will not give sleep to my eyes
or slumber to my eyelids,
[5] until I find a place for the LORD,
a dwelling place for the Mighty One of Jacob.”
[6] Lo, we heard of it in Eph’rathah,
we found it in the fields of Ja’ar.
[7] “Let us go to his dwelling place;
let us worship at his footstool!”
[8]
Arise, O LORD, and go to thy resting place,
thou and the ark of thy might.
[9] Let thy priests be clothed with righteousness,
and let thy saints shout for joy.
[10] For thy servant David’s sake
do not turn away the face of thy anointed one.
[11] The LORD swore to David a sure oath
from which he will not turn back:
“One of the sons of your body
I will set on your throne.
[12] If your sons keep my covenant
and my testimonies which I shall teach them,
their sons also for ever
shall sit upon your throne.”
It is important to recall that St. Mary has been given the title Ark of the New Covenant, implicitly confirmed by the Gospel of St. Luke–see
here for details.
This teaching is probably the hardest to accept. What the commentators have made of Psalm 132 in general and v. 8 in particular over the centuries would be interesting to find out as well.