Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: A man came to the Prophet (peace and blessings be upon him) and said: What deed is there that, if I do it, I will enter Paradise? He (peace and blessings be upon him) said: "Are you in a town to which water is brought (from afar)?" He said: Yes. He (peace and blessings be upon him) said: "Then buy a new waterskin with it, then keep drawing water with it until it wears through, for it will not wear through before you have reached, by means of it, the deed of Paradise."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12552