Majma al-Zawaid — Hadith 18438

Sayyiduna Utbah bin Abd (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "If a man were to fall on his face from the day he was born until the day he dies in old age, seeking the pleasure of Allah Almighty (perhaps meaning that he remained in prostration), on the Day of Resurrection he would consider even this deed insignificant."
Imam al-Tabarani recorded it; its chain contains Baqiyyah, who is a mudallis; the rest of its narrators are thiqat (trustworthy). Before this, in Kitab al-Iman, in the chapter on the rights of Allah Almighty over His servants,
this narration has already passed.