Sahih Bukhari

Once the Prophet (ﷺ) came while a woman was sitting with me. He said, "Whois she?" I replied, "She is so and so," and told him about her(excessive) praying. He said disapprovingly, "Do (good) deeds which iswithin your capacity (without being overtaxed) as Allah does not gettired (of giving rewards) but (surely) you will get tired and the bestdeed (act of Worship) in the sight of Allah is that which is doneregularly."