Mukhtasar Sahih Bukhari — Hadith 2077

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When any of you prays, he should ask Allah with certainty (that grant me this thing), and he should not say: If You will, then forgive, and if You will, then have mercy on me. For there is no one who can force or compel Allah."