Ash'ath (ibn Abi al-Sha'tha) narrated from his father, who was among the students of Sayyiduna Abdullah ibn Mas'ud (may Allah be pleased with him), that I saw with a man a scroll in which something was written: «سبحان الله والحمد لله ولا إله إلا الله والله أكبر». I said: Write it for me as well, but he acted stingily, then he promised me that he would give me that scroll. Then I came to Sayyiduna Abdullah ibn Mas'ud (may Allah be pleased with him) and saw that same scroll was before him. He said: In this writing there is innovation, trial, and misguidance. It was things like this that destroyed those before you; they wrote it, their tongues relished it, and it settled in their hearts. So I urge every man that if he knows the place of any such book, he should inform me, and I make him swear. Shu'bah said: And he made them swear. The narrator said: I think he swore and said that if that book was in any place in India, which would be far from Kufa, I would reach there even if I had to go on foot.