Musnad Ahmad 30:515

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from Humayd ibn 'Abd al-Rahman, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever spends a pair of his wealth in the way of Allah will be called from the gates of Paradise, and Paradise has gates. So whoever is among the people of prayer will be called from the gate of prayer, and whoever is among the people of charity will be called from the gate of charity, and whoever is among the people of jihad will be called from the gate of jihad, and whoever is among the people of fasting will be called from the gate of al-Rayyan." Abu Bakr said: "By Allah, O Messenger of Allah, there is no necessity for anyone to be called from any of them, but will anyone be called from all of them, O Messenger of Allah?" He said: "Yes, and I hope that you are one of them."