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Evidence of knowledge of the coffee tree and coffee drinking becomes more concrete by the late 15th century; Sufi Imam Muhammad Ibn Said Al Dhabhani is known to have imported goods from Ethiopia to Yemen. Coffee was first exported out of Ethiopia to Yemen by Somali merchants from Berbera and Zeila, which was procured from Harar and the Abyssinian interior. According to Captain Haines, who was the colonial administrator of Aden (1839-1854), Mocha historically imported up to two-thirds of their coffee from Berbera-based merchants before the coffee trade of Mocha was captured by British-controlled Aden in the 19th century. Thereafter, much of the Ethiopian coffee was exported to Aden via Berbera.

"Berbera not only supplies Aden with horned cattle and sheep to a very large extent, but the trade between Africa and Aden is steadily increasing greatly every year. In the article of coffee alone there is considerable export, and ' Berbera' coffee stands in the Bombay market now before Mocha. The coffee shipped at Berbera comes from far in the interior from Hurrar, Abyssinia, and Kaffa. It will be to the advantage of all that the trade should come to Aden through one port, and Berbera is the only place on the coast there that has a protected port, where vessels can lie in smooth water.”

Sufis in Yemen used the beverage as an aid to concentration and as a kind of spiritual intoxication when they chanted the name of God. Sufis used it to keep themselves alert during their nighttime devotions. A translation of Al-Jaziri's manuscript traces the spread of coffee from Arabia Felix (present-day Yemen) northward to Mecca and Medina, and then to the larger cities of Cairo, Damascus, Baghdad, and Constantinople. By 1414, the plant was known in Mecca, and in the early 1500s was spreading to the Mameluke Sultanate of Egypt and North Africa from the Yemeni port of Mocha. Associated with Sufism, myriad coffee houses grew up in Cairo (Egypt) around the religious University of the Azhar. These coffee houses also opened in Syria, especially in the cosmopolitan city of Aleppo, and then in Istanbul, the capital of the Ottoman Empire, in 1554. In 1511, it was forbidden for its stimulating effect by conservative, orthodox imams at a theological court in Mecca. However, these bans were to be overturned in 1524 by an order of the Ottoman Turkish Sultan Suleiman I, with Grand Mufti Mehmet Ebussuud el-İmadi issuing a fatwa allowing the consumption of coffee. In Cairo a similar ban was instituted in 1532, and the coffeehouses and warehouses containing coffee beans were sacked. During the 16th century, it had already reached the rest of the Middle East, the Safavid Empire and the Ottoman Empire. From the Middle East, coffee drinking spread to Italy, then to the rest of Europe, and coffee plants were transported by the Dutch to the East Indies and to the Americas.

Similarly, coffee was banned by the Ethiopian Orthodox Church some time before the 18th century. However, in the second half of the 19th century, Ethiopian attitudes softened towards coffee drinking, and its consumption spread rapidly between 1880 and 1886; according to Richard Pankhurst, "this was largely due to Emperor Menelik, who himself drank it, and to Abuna Matewos who did much to dispel the belief of the clergy that it was a Muslim drink."

The earliest mention of coffee noted by the literary coffee merchant Philippe Sylvestre Dufour is a reference to bunchum in the works of the 10th century CE Persian physician Muhammad ibn Zakariya al-Razi, known as Rhazes in the West, but more definite information on the preparation of a beverage from the roasted coffee berries dates from several centuries later. One of the most important of the early writers on coffee was Abd al-Qadir al-Jaziri, who in 1587 compiled a work tracing the history and legal controversies of coffee entitled Umdat al Safwa fi hill al-qahwa. He reported that one Sheikh, Jamal-al-Din al-Dhabhani (d. 1470), mufti of Aden, was the first to adopt the use of coffee (circa 1454).

He found that among its properties was that it drove away fatigue and lethargy, and brought to the body a certain sprightliness and vigour.