Hadith No: 1
Ibn Abd al-Barr - Jami' Bayan al-'Ilm wa Fadlihi
Chapter on What Was Narrated Regarding the Condemnation of Speaking About Allah, the Exalted, in Matters of Religion Based on Opinion, Speculation, and Analogical Reasoning Without a Foundation, and the Defect of Overindulging in Questions Without Due Consideration
Volume: (2) - Page Number: (1082)
[The text is lengthy, so only the relevant excerpt is provided here]
2109 - .... And it was said to Yahya ibn Ma'in: O Abu Zakariya, did Abu Hanifa speak the truth in his narrations? He replied: Yes, he was truthful And it was also said to him: Did al-Shafi'i lie in his narrations? He said: I did not like his hadith or mention of him, and it was said to Yahya ibn Ma'in: Which do you prefer, Abu Hanifa, al-Shafi'i, or Abu Yusuf al-Qadi? He replied: As for al-Shafi'i, I do not like his hadith.

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Reference: Jamea' Bayaan al-Ilm wa Fadleh Book 2

Hadith No: 2
Ibn Abd al-Barr - Jami' Bayana al-'Ilm wa Fadlihi - Chapter on the Rulings of Scholars' Statements about One Another
Volume: (2) - Page Number: (1113)
[The text is lengthy, so only the relevant excerpt is provided here]
2179 - .... And among the things that were criticized and also held against Ibn Ma'in was his statement about al-Shafi'i: "He is not trustworthy."

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Reference: Jamea' Bayaan al-Ilm wa Fadleh Book 2

Hadith No: 3
Ibn Hajar al-Asqalani - Lisan al-Mizan - Letter M - Those Named Mu'mir
Volume: (6) - Page Number: (67)
[The text is lengthy, so only the relevant excerpt is provided here]
259 - Mu'mir ibn Shabib ibn Shaybah, al-Mu'afa narrated in the sixty-fourth sitting of al-Jalis, stories from Muhammad ibn Makhlad, from Muhammad ibn al-Hasan ibn Maymun, from Wazir ibn Muhammad, from him, including deniable reports. Among them is one from Mu'mir ibn Shabib, that he heard al-Ma'mun say: "I tested al-Shafi'i in everything and found him to be complete. However, there remains one trait: if I were to give him Indian lettuce, it would overcome the man with a robust body and sound mind." He then told me: Thabat the servant informed me that he was summoned and given a ratl, and he said: "O Commander of the Faithful, I have never drunk this," but he insisted, and he drank it. Then he continued to give him twenty ratls, yet neither his mind changed nor did he cease to present arguments." I said, "Perhaps al-Shafi'i drank it out of caution, as he considered caution before the caliphs to be permissible."

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Reference: Lisaan al-Meezan Book 6