question #1 Sahih Muslim 1027c, Book 12, Hadith 110 : What is the significance of spending in pairs for the sake of Allah in Islam?

He who spent pairs for the sake of Allah, the guardians of Paradise would call him, (in fact) every guardian of the door (of Paradise would welcome him saying): O, so and so, come on. Upon this Abu Bakr said: Messenger of Allah, (it means) there would be no distress on this person. The Messenger of Allah (ﷺ) said. I hope you would be among them.