Mukhtasar Muslim

Narrated from Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) that when Hawla bint Tuwait passed by in the presence of the Messenger of Allah (peace and blessings be upon him), I said to the Prophet (peace and blessings be upon him): "This is Hawla bint Tuwait, and people say that she does not sleep at night (engaged in worship)." The Prophet (peace and blessings be upon him) said: "Do deeds according to your capacity. By Allah, Allah does not tire (of giving reward), but you will tire."