“The Prophet—may Allah’s peace and blessings be upon him—would not fast in any month more than he fasted in Shaʿbān; indeed, he would fast all of Shaʿbān. And he used to say: ‘Take on deeds according to what you are able, for Allah does not tire until you tire.’
And the most beloved prayer to the Prophet—may Allah’s peace and blessings be upon him—was that which was done consistently, even if it was little. And when he performed a prayer, he would maintain it regularly.”

Narrated by al-Bukhārī (no. 1970), with the wording being his, and Muslim (no. 782), from the ḥadīth of ʿĀʾishah (may Allah be pleased with her).
And in another narration reported by Muslim (no. 746): “When the Messenger of Allah (may Allah’s peace and blessings be upon him) performed a deed, he would make it consistent.”

Brief Explanation of the Hadith

Part of the guidance of the Prophet (may Allah’s peace and blessings be upon him) was consistency in acts of worship. Among that was his frequent fasting in the month of Shaʿbān. ʿĀʾishah (may Allah be pleased with her) said: “The Prophet (may Allah’s peace and blessings be upon him) would not fast in any month more than Shaʿbān; indeed, he would fast all of Shaʿbān,” meaning: most of it and the greater part of it. As stated in another narration: “He used to fast all of Shaʿbān; he used to fast Shaʿbān except a little,” despite the effort involved—especially since the month of Ramaḍān follows it immediately. Yet, even so, he (may Allah’s peace and blessings be upon him) would encourage his Ummah to commit to manageable deeds that they could sustain, saying: “Take on deeds according to what you are able, for Allah does not tire until you tire.” That is, adhere to such acts of righteousness as you are able to maintain without hardship. For a small deed performed consistently carries greater reward and is more likely to be accepted than a strenuous deed that often leads to weariness and discontinuation. This shows that his own practice (may Allah’s peace and blessings be upon him) was in accordance with the perfection of his strength and the loftiness of his resolve. As for his guidance to his Ummah, it was founded upon gentleness and mercy—directing them to what they could sustain in obedience without hardship or interruption.
Then she (may Allah be pleased with her) informed by saying: “And the most beloved prayer to the Prophet (may Allah’s peace and blessings be upon him) was that which was done consistently, even if it was little.” That is, a small deed—whether prayer, fasting, recitation of the Qur’ān, or otherwise—if maintained regularly by a person, was more beloved to him than a large amount that is done intermittently and then discontinued.
In this there is a tremendous benefit: encouragement to remain consistent in acts of obedience, and that perseverance in even a small deed is more likely to be accepted and carries greater blessing than abundant action followed by interruption.