Musnad Abi Ya'la 440 — he said: Will none of you stand and pray four

It is narrated from Sayyiduna Ali (may Allah be pleased with him) that he said: "Will none of you stand and pray four (voluntary) rak'ahs before Asr, and say in them the words that the Messenger of Allah (peace and blessings be upon him) used to say: 'Tamma nuruka fa-hadayta, fa-lakal-hamd; 'azuma hilmuka fa-'afawta, fa-lakal-hamd; basatta yadaka fa-a'tayta, fa-lakal-hamdu rabbana; wajhuka akramul-wujuh, wa jahuka a'zamul-jah, wa 'atiyyatuka afdalul-'atiyyati wa ahna'uha; tuta'u rabbana fa-tashkur, wa tu'sa rabbana fa-taghfir, wa tujibul-mudtarr, wa takshifud-durr, wa tashfis-saqim, wa taghfirudh-dhanb, wa taqbalut-tawbah, wa la yajzi bi-ala'ika ahad, wa la yablughu midhataka qawlu qa'il' ((O Allah,) Your light was perfected, so You guided, so all praise is Yours; Your forbearance is immense, so You pardoned, so all praise is Yours; You spread out Your hand (of generosity), so You gave (abundantly), so to You belongs all thanks, O our Lord; Your Being is the most noble, Your standing is the greatest, and Your gift is the best and most pleasant of gifts. O our Lord, You are obeyed and You show appreciation; You are disobeyed and You forgive; You answer the one in distress, remove harm, cure the sick, forgive sin and accept repentance. No one can repay Your favours, and the words of no speaker can reach (the full measure of) Your praise)."