What is the meaning of the phrase, "I said to them, 'Should his Hadith be used as proof?' They said, 'The Hadith of Abu Arubah and Al-Dustu'i should be used as proof; this is a shaykh whose Hadith is written down,' which appears in the biography of Sa'id ibn Bashir al-Basri in "Al-Taqrib," and who is meant by it?

The phrase in Ibn Hajar al-Asqalani's book "Tahdheeb al-Tahdheeb" refers to Sa'id bin Bashir al-Azdi al-Basri. Ibn Abi Hatim mentioned that his father and Abu Zur'ah said about him: "He is deemed truthful by us." When he asked them: "Is his hadith used as proof?" They replied: "The hadith of Abu 'Arubah and al-Dastawa'i is used as proof; this shaykh's hadith should be written down." This statement is a commendation for Sa'id bin Bashir, but he is not among those considered trustworthy in precision and memorization. Rather, he is one whose hadith is written down, and his hadith is used as proof if there is a corroborator for it; otherwise, it is not.