Sahih Muslim · Hadith 1308
The Book of Mosques and Places of Prayer - كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
وحدثناه ابن أبي عمر، حدثنا عبد العزيز بن عبد الصمد، عن منصور، بإسناد هؤلاء وقال " فليتحر الصواب " .
This hadith has been narrated by Mansur and he said: " He should aim at correctness."
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).