There are forty good qualities, the best of which is the lending of a milch goat. Anyone carries out any of these virtuous deeds seeking its reward (from Allah) with firm confidence that he will receive it, Allah will admit him to Paradise
Authentic hadithعن أبي محمد عبد الله بن عمرو بن العاص رضي الله عنهما ، قال: قال رسول الله صلى الله عليه وسلم : «أربعون خَصْلَة: أعلاها مَنيحةُ العَنز، ما من عامل يَعمل بِخَصْلة منها؛ رجاء ثوابها وتصديق مَوْعُودِها، إلا أدخله الله بها الجنة».
Abu Muhammad Abdullāh ibn ‘Amr ibn al-‘Ās (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "There are forty good qualities, the best of which is the lending of a milch goat. Whoever carries out any of these virtuous deeds seeking its reward (from Allah) with firm confidence that he will receive it, Allah will admit him to Paradise."
Explanation
The Prophet (may Allah's peace and blessings be upon him) encourages his Ummah to do goodness that involves, as he mentioned, forty good qualities. He mentioned only one quality, which is the best of them, and kept the rest unknown. This quality is the case when a sheep owner lends a poor person a milch goat to benefit from its milk and return it after meeting his/her need to its owner. This Hadīth indicates that righteous deeds are easy and numerous, and thus people should compete in doing them.
Source · Narrated by Bukhari
From the Hadith Encyclopedia (hadeethenc.com).