(Second chain) The Messenger of Allah, peace and blessings be upon him, said: Whoever among the Muslims spends a pair from his wealth in the way of Allah, the gatekeepers of Paradise will welcome him, and each one of them will call him towards what he has with him. I asked: How will this "pair, pair" be? He, peace and blessings be upon him, said: If they are riding animals, then two riding animals; if they are camels, then two camels; and if they are cows, then two cows.
Hadith Referenceالفتح الربانی / كتاب الجهاد / 4856