Sahih Muslim, through the chain of Ismaʿil ibn Jaʿfar, from ʿAbd Allah ibn ʿAbd al-Rahman—better known as Abu Tuwalah.

To the best of my knowledge—and Allah knows best—al-Bukhari did not record anything from Abu Yunus at all.

Abu ʿAbd Allah al-Hakim said—after listing a number of the noble leading Successors in Madinah, such as Ibn al-Musayyib and those who followed him—“No one in their time was uniquely singled out so that people would spur their camels from distant regions to reach him in preference to anyone else. When they passed away and their age came to an end, men like Ibn Shihab, Rabiʿah, Yahya ibn Saʿid, ʿAbd Allah ibn Yazid ibn Hurmuz, Abu al-Zinad, and Safwan ibn Sulaym began to teach. All of them issued legal opinions in Madinah, yet not one of them alone became the destination for arduous journeys. That era too elapsed, and the description of ‘the scholar of the people of Madinah’ did not become applicable to any of them.

“After them Mālik appeared. He was the city’s mufti, and to him people travelled from every direction; they acknowledged his authority, and eminent imams who were older than he narrated from him—such as al-Layth, the scholar of Egypt and the Maghrib; al-Awzaʿi, the scholar and mufti of Syria; al-Thawri, the foremost scholar of Kufah; and Shuʿbah, the scholar of Basrah.

“He went on to say: Even before those men, Yahya ibn Saʿid al-Ansari had transmitted from Mālik when Abu Jaʿfar appointed him chief judge. As he was setting out for Iraq he asked Mālik to write for him one hundred hadiths. And before that, Ibn Jurayj had already taken narrations from him.”

Abu Musʿab relates: I heard Mālik say, “I entered upon Abu Jaʿfar, the Commander of the Faithful. He had settled himself on a dais—meaning his couch—and upon his carpet were two tame beasts that neither defecated nor urinated. A young boy kept coming in and then leaving. He said to me, ‘Do you know who this is?’ I replied, ‘No.’ He said, ‘This is my son; he is merely startled by the awe you inspire.’

“He then questioned me about various matters, some lawful and some unlawful. After that he said, ‘By Allah, you are the most intelligent of people and the most knowledgeable of people.’

“I answered, ‘By Allah, no, O Commander of the Faithful!’

“He replied, ‘Indeed you are, but you conceal it.’

“Then he said, ‘By Allah, if I remain alive I shall record your statements just as the Qur’ans are recorded, and I shall send them to…’”