Nafi' narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you is at a meal, let him not hurry until he has eaten what he needs, even if the iqamah for prayer has been called."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5040