It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The best of charities are: providing the shade of a tent (for the fighters) in the path of Allah, or giving a (young) she-camel fit for mating in the path of Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7885