Urwah (may Allah have mercy on him) narrates from the Messenger of Allah (peace and blessings be upon him) that he said: "When the evening meal has been set out and the iqamah for prayer has been called, begin with the meal." These are the words of Ibn Iyad.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5036