Amr bin Dinar narrates: It was asked from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) about an issue of breastfeeding, so he said: "To my knowledge, Allah Almighty has declared the foster sister unlawful (for marriage)." It was said to him that Sayyiduna Abdullah bin Zubair (may Allah be pleased with him) says: "Unlawfulness is not established by suckling once or twice." So Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: "The decision given by Allah Almighty is better than your decision and the decision of Abdullah bin Zubair."