Aldous Huxley

The pairing predates him: William James wrote in 1902 that nitrous oxide and ether 'stimulate the mystical consciousness in an extraordinary degree'. Huxley himself refused to equate mescalin with the Beatific Vision.

William James, The Varieties of Religious Experience (1902), Lectures XVI and XVII, 'Mysticism'; Aldous Huxley, The Doors of Perception (1954)

English novelist who took mescaline in May 1953 and described it in The Doors of Perception (1954).

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Primary source

Aldous Huxley, The Doors of Perception, 1954Huxley declined to equate the mescalin experience with Enlightenment or the Beatific Vision, and described Mind at Large funnelled through the brain's reducing valve.
I am not so foolish as to equate what happens under the influence of mescalin
Aldous Huxley, The Perennial Philosophy, 1945, IntroductionHuxley's perennial philosophy holds a divine Ground of all existence that can be directly experienced and realised.
The divine Ground of all existence is a spiritual Absolute
William James, The Varieties of Religious Experience, 1902, Lectures XVI and XVII, MysticismIn 1902 James reported that nitrous oxide and ether stimulate mystical consciousness, half a century before Huxley's mescalin account.
stimulate the mystical consciousness in an extraordinary degree