Musannaf Ibn Abi Shaybah 7870 — Counting tasbih on the fingers

It was the practice of Sayyiduna Abu Sa'id (may Allah be pleased with him) that he would take three pebbles and place them on one of his thighs. Then he would say a glorification and pick up one pebble, then say a glorification and pick up another pebble, then say a glorification and pick up the third pebble too. Then he would put all the pebbles back and repeat the same. And he would say: Do not glorify in such a way that a whistling sound comes out.