Musannaf Ibn Abi Shaybah 8038 — Those who permitted that

Sayyiduna Abu Dharr (may Allah be pleased with him) said: I asked the Prophet (peace and blessings be upon him) about many things. Once I asked him whether one may move the pebbles during prayer. He said: "Straighten them once; and if you do not need to, then do not do it even once."