Sahih Muslim · Hadith 1307
The Book of Mosques and Places of Prayer - كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
وحدثناه يحيى بن يحيى، أخبرنا فضيل بن عياض، عن منصور، بهذا الإسناد وقال " فليتحر الذي يرى أنه الصواب " .
This hadith has been reported by Mansur with the same chain of transwitters and he said: " He should aim at what is according to him correct."
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).