Musannaf Ibn Abi Shaybah 37504 — The words of Ibn Abbas

It is narrated from Antarah that he said: I asked Sayyiduna Ibn Abbas (may Allah be pleased with them both): Which deed is best? He said: The remembrance of Allah is the greatest deed. No people sit in a house teaching the Book of Allah among themselves except that the angels shade them with their wings, and as long as they remain in this work they are the guests of Allah, until they turn to some other talk.