Sayyar bin Manzur, a man of Banu Fazarah, narrates from his father, from a woman called Buhaysah, from her father (may Allah be pleased with him), that she said: My father sought permission from the Prophet (peace and blessings be upon him). He entered, kissed him and clung to him, and said: "O Prophet of Allah! What is the thing which it is not lawful to withhold?" He said: "Water." Then he said: "O Prophet of Allah! What is the thing which it is not lawful to withhold?" He said: "Salt." Then he said: "O Prophet of Allah! What is the thing which it is not lawful to withhold?" He said: "Whatever good you do is better for you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب إحياء الموات / 11830