Trove is the online Australian source for newspapers....
REES.—On the 8th inst., at his residence, St. John's-road, Toorak, Rev. David Rees, Baptist minister,
aged 80 years.
THE Friends of the late Rev. DAVID REES are respectfully invited to follow his remains to the
place of interment, St. Kilda Cemetery.
The funeral is appointed to leave his late residence, Rawden-cottage, St. John's road, off Malvern-
road, Toorak, THIS DAY (Friday, 9th inst.), at 4 o'clock p.m.
JOHN ROMANIS, undertaker, 64 Toorak-road, South Yarra.
both from
The Argus, Melbourne 9th Jan 1885; the death notie is repeated verbatim in some other newspapers.
https://trove.nla.gov.au/newspaper/article/220545627?searchTerm=david%20rees carries an obituary -
Weekly Times, Melbourne, 10th Jan, page 7, which reads:
The Rev. David Rees, Baptist minister, died at his residence, St. John's road, Toorak, on Thursday. The late reverend I gentleman was born in the parish of Llanelly, Carmarthenshire, South Wales, in 1804, and had consequently attained the I ripe age of eighty years. He was last settled in England at Braintree, Essex, where he laboured with much earnestness and zeal.
In 1859 he landed in this colony, and after a snort lime spent in Geelong, undertook the pastorate of the South Yarra Baptist Church. An affection of. the throat compelled him to resign this charge in 1869, and to recruit his health he took a trip to England, accompanied by his son, the late Dr. W. G. Rees, of South Yarra. On returning to the colony, he constantly engaged in preaching, but he never took the pastorate of any church again except once for a few months only. He was a man of high intellectual attainments and an enthusiast in nearly all branches of natural science, more especially astronomy, on which he frequently lectured.
To him mainly the Baptist Association owes its origin. In 1879 he took another trip to England, and since his return in 1881 he has been gradually growing more and more infirm, until he finally succumbed on Thursday afternoon.
You might try Welsh Newspapers website, but hunting for a David Rees will be a challenge!