9. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa in a marfu‘ manner who has said the following: “Abu ‘Abd Allah , has said that when you stand up for Salah (prayer), you must not play with your beard, your head or with pebbles while you pray, except when you prepare (pebbles) as you are about to do sajdah in which case it is not an offense.”