Fatimah bint Husayn (may Allah have mercy on her) narrates from her father, Sayyiduna Husayn bin Ali (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "The one who asks has a right, even if he comes riding a horse."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2880