Chapter 1: Introduction
Abd Allah bin Abd ir-Rahman ad-Dārimī narrated to us, Marwān, meaning Ibn Muhammad ad-Dimashqī informed us, Sa’īd bin Abd il-Azīz narrated to us, on authority of Sulaymān bin Mūsā, he said, I said to Tāwus: ‘So-and-so narrated to me like this-and-that’. He said: ‘If your companion is trustworthy, then take from him.’
Sahih Muslim Introduction 29