Sa’sa’ah bin Mu’awiyah said: I met Sayyiduna Abu Dharr (may Allah be pleased with him) who was taking his camel and had a water-skin hanging from his neck. I asked, “O Abu Dharr! What is this? What has happened to you?” He replied, “This is my work.” I asked again, “What has happened to you?” He again replied, “This is my work.” I said, “Narrate to me a hadith which you heard from the Messenger of Allah (peace and blessings be upon him).” He said: I heard the Messenger of Allah (peace and blessings be upon him) saying: “Whoever among the Muslims spends a pair (of something) in the way of Allah, the gatekeepers of Paradise will hasten to welcome him.”
In the narration of Nasa’i, it is stated: “The gatekeepers of Paradise will call him towards themselves (to enter through their gate).” Imam Darimi (may Allah have mercy on him) said: By ‘pair’ is meant: two dirhams, or two slave girls, two slaves, or two riding animals.
It is narrated in al-Nasa’i that a certain narrator asked Sayyiduna Abu Dharr radi Allahu anhu: What is meant by “a pair” (zawjayn)? He replied: If a person owns camels, then he gives two camels in the way of Allah, and if he owns cows, then he gives two cows in the way of Allah, then for him is this reward.
From this hadith, the virtue of spending even two rupees, or two dirhams, or two dinars in the way of Allah is understood—that on the Day of Resurrection, he will be called from every gate of Paradise.