أَخْبَرَنَا شُعَيْبُ بْنُ يُوسُفَ، عَنْ يَحْيَى، عَنْ هِشَامٍ، قَالَ أَخْبَرَنِي أَبِي، عَنْ عَائِشَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم دَخَلَ عَلَيْهَا وَعِنْدَهَا امْرَأَةٌ فَقَالَ " مَنْ هَذِهِ " . قَالَتْ فُلاَنَةُ لاَ تَنَامُ . فَذَكَرَتْ مِنْ صَلاَتِهَا فَقَالَ " مَهْ عَلَيْكُمْ بِمَا تُطِيقُونَ فَوَاللَّهِ لاَ يَمَلُّ اللَّهُ عَزَّ وَجَلَّ حَتَّى تَمَلُّوا وَلَكِنَّ أَحَبَّ الدِّينِ إِلَيْهِ مَا دَاوَمَ عَلَيْهِ صَاحِبُهُ " .
It was narrated from Aishah that: The Prophet (PBUH) came in to her and there was a woman with her. He said: "Who is this?" She said: "So-and-so, and she does not sleep." And she told him about how she prayed a great deal. He said: "Stop praising her. You should do what you can, for by Allah (SWT), Allah never gets tired (of giving reward) until you get tired. And the most beloved of religious actions to Him is that in which a person persists." Translation Not Available
Book Ref: Sunan An Nisai Book 20 Hadith 1642
Web Ref: Sunan An Nisai Vol 2 Book 20 Hadith 1643