Musannaf Ibn Abi Shaybah 37789 — Reports on the virtue of remembering

It is narrated from Salim bin Abi al-Ja'd that he said: It was said to Sayyiduna Abu al-Darda (may Allah be pleased with him) that Abu Sa'd bin Munabbih had freed 100 slaves from his wealth. He said: "Indeed, 100 freed slaves from the wealth of one man is a great thing. But shall I not tell you of something better than that? Cling to faith night and day, and let your tongue remain constantly moist with the remembrance of Allah."