Sunan an-Nasa'i, hadith 5035

أَخْبَرَنَا شُعَيْبُ بْنُ يُوسُفَ عَنْ يَحْيَى وَهُوَ ابْنُ سَعِيدٍ عَنْ هِشَامِ بْنِ عُرْوَةَ أَخْبَرَنِي أَبِي عَنْ عَائِشَةَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ دَخَلَ عَلَيْهَا وَعِنْدَهَا امْرَأَةٌ فَقَالَ مَنْ هَذِهِ قَالَتْ فُلَانَةُ لَا تَنَامُ تَذْكُرُ مِنْ صَلَاتِهَا فَقَالَ مَهْ عَلَيْكُمْ مِنْ الْعَمَلِ مَا تُطِيقُونَ فَوَاللَّهِ لَا يَمَلُّ اللَّهُ عَزَّ وَجَلَّ حَتَّى تَمَلُّوا وَكَانَ أَحَبَّ الدِّينِ إِلَيْهِ مَا دَامَ عَلَيْهِ صَاحِبُهُ

It was narrated from 'Aishah that:The Prophet [SAW] entered upon her and there was a woman with her. He said: "Who is this?" She said: "So-and-so; she does not sleep"- she mentioned her excessive praying. The Prophet [SAW] said: "Keep quiet. You should do what you are able to, for by Allah, Allah, the Mighty and Sublime, does not get tired. The most beloved religion to Him is that in which a person persists