Ali bin al-Madini (may Allah have mercy on him) said: Yahya bin Sa'id al-Qattan (may Allah have mercy on him) said: (The narration of) Hammad bin Salamah from Ziyad al-A'lam and Qays bin Sa'd is not up to standard. Then Yahya said: If what Hammad bin Salamah narrated from Qays bin Sa'd is true, then Qays bin Sa'd is worth nothing; but the hadith of Hammad bin Salamah from the (well-known) shaykhs, from Thabit and this kind (is reliable), meaning that he is firm in them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7269