‘Utbah ibn ‘Abdu Sullami reported: The Prophet, peace and blessings be upon him, said, “Were a man to fall upon his face in prostration from the day he was born until the day he died as an old man, seeking the pleasure of Allah Almighty, he would still consider his good deeds to be insignificant on the Day of Resurrection.”
Source: Musnad Aḥmad 17649
Grade: Sahih li ghayihi (authentic due to external evidence) according to Al-Albani
عَنْ عُتْبَةَ بْنِ عَبْدٍ السُّلَمِيَّ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ لَوْ أَنَّ رَجُلًا يَخِرُّ عَلَى وَجْهِهِ مِنْ يَوْمِ وُلِدَ إِلَى يَوْمِ يَمُوتُ هَرَمًا فِي مَرْضَاةِ اللهِ لَحَقَّرَهُ يَوْمَ الْقِيَامَةِ
17649 مسند أحمد بن حنبل
3596 المحدث الألباني خلاصة حكم المحدث صحيح لغيره في صحيح الترغيب