Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) states: I asked the Prophet (peace and blessings be upon him) about smoothing the pebbles with the hand, and he said: Do it once; and if you refrain even from that, it is better than a hundred she-camels, all of them with black eyes.
Imam Ahmad recorded it; its chain contains Shurahbil bin Sa'd, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2473