There is no Biblical basis to the Assumption of Mary. It was an apocryphal belief established in the 4th century, and later added to Catholic canon in the 1950's. There are no remaining records of the belief from before that time, and it appears to have originated from the pagan beliefs of the areas Christianity had spread into.

There is no Biblical basis to the Assumption of Mary.

the Bible seems to be silent about it, and even the early fathers of the Church say nothing about it.

It was an apocryphal belief established in the 4th century, and later added to Catholic canon in the 1950's.

Although the Assumption (Latin: assumptio, "a taking") was only relatively recently defined as infallible dogma by the Catholic Church, and in spite of a statement by Saint Epiphanius of Salamis in AD 377 that no one knew whether Mary had died or not,[7] apocryphal accounts of the assumption of Mary into heaven have circulated since at least the 4th century.

There are no remaining records of the belief from before that time, and it appears to have originated from the pagan beliefs of the areas Christianity had spread into.

The origin of this idolatry had its root in ancient mythology. Astarte of the Assyrians, Ashtoreth of the Sidonians and Bowaney of the Hindoos held the place that Mary occupies in the church of Rome. Greece had her Venus and Rome her Juno. The Diana of the Ephesians was a female, from whose body in every part there seemed to be issuing all the various animals of creation, symbolizing the conception and creation of all things.