Nafi' (may Allah have mercy on him) narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When the evening meal has been set out and the iqamah for prayer has been called, begin with the meal, and do not hurry until you have finished it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5038