(inshallah.org) 365 Tidbits About Ethiopia and Islam – 66)
“A frequently heard comment in praise of khat by Muslim users is that it enables them to pray without becoming drowsy even throughout the nights of Ramadan.
In Ethiopia and Yemen, stories are told of divine guidance in the discovery of khat and the high regard in which the drug was held by Muslim Saints.
A well-known legend tells of sheikh Ibrahim Abu Zarbay, one of 44 Muslim saints who came from hadhramaut (eastern Yemen) to Ethiopia in about A.D. 1430 on a proselytizing mission. He traveled to Harar, converted many to Islam, and is said to have introduced khat to Yemen up on his return.)”
(Source: The Cambridge World History of Food, Volume 1)