It is narrated from Sayyiduna Adi bin Hatim (may Allah be pleased with him) that he said: "O Messenger of Allah, which charity is the best?" He (peace and blessings be upon him) said: "The service of a slave in the path of Allah (that is, providing a servant to a mujahid), or the shade of a tent, or (giving) a she-camel fit for mating."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Adi bin Hatim (may Allah be pleased with him) only with this chain; Mu'awiyah is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الباء / 3296
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 2466، والترمذي فى «جامعه» برقم: 1626، وسعيد بن منصور فى «سننه» برقم: 2407، والطبراني فى «الكبير» برقم: 255»