Abu al-Aliyah (may Allah have mercy on him) said: Ubaydullah bin Ziyad (may Allah have mercy on him) delayed the prayer, so I met Abdullah bin al-Samit (may Allah have mercy on him). He struck my thigh and said: I put this question to my close friend Sayyiduna Abu Dharr (may Allah be pleased with him), and he said: I asked my close friend, the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Offer the prayer at its proper time; if you find the congregation, pray with them, and do not say: I have already prayed, so I will not pray now."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3637