This is a discussion of the chain. Imam al-Zuhri (may Allah have mercy on him) said: Makhul (may Allah have mercy on him) used to come to us, and Sulayman bin Musa (may Allah have mercy on him); by Allah, Sulayman bin Musa (may Allah have mercy on him) is the more reliable narrator of the two.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13601