Silsilat al-Ahadith al-Sahihah

Sayyiduna Fadala (may Allah be pleased with him) says that a man came and said: O Messenger of Allah! May Allah send mercy upon you, (please tell me) which deed is closest to jihad? The Prophet (peace and blessings be upon him) said: "The deed closest to Allah is striving in His path (jihad), and there is no deed like it, except for a person like this." Then the Prophet (peace and blessings be upon him) pointed towards a man who stands (in prayer) and does not become lazy in standing, nor is he negligent in fasting.