Abdullah bin al-Samit reports from Sayyiduna Abu Dharr (may Allah be pleased with him), attributing it to the Prophet, that he (peace and blessings be upon him) struck my thigh and asked: "How will you be when you remain among a people who delay the prayer from its time?" Then he said: "Pray the prayer at its time, then go out; and if you are in the mosque and the iqamah is called, pray with them."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5338