Silsilah as-Sahihah 773 — Tasbeeh in bowing and prostration

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) was in the state of bowing or prostration, he would recite this supplication: "You are pure with Your praises, I seek forgiveness from You and turn to You in repentance."