Musnad Ahmad 740
`Ali (رضي الله عنه) narrated that Fatimah (رضي الله عنها) complained to the Prophet (ﷺ) about marks left on her hands from making dough. Some female captives were brought to the Prophet (ﷺ)  and she went to ask him for a servant, but she did not find him so she came back. Then he came to us when we had gone to bed. I went to get up, but he said:
`Stay where you are.” He came and sat down, and I could feel the coolness of his feet. And he said: “Shall I not tell you of something that is better for you than a servant? When you go to your bed, say Subhan Allah thirty three times, Alhamdulillah thirty three times and Allahu Akbar thirty four times.`
حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا شُعْبَةُ، عَنْ الْحَكَمِ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، حَدَّثَنَا عَلِيٌّ، أَنَّ فَاطِمَةَ، شَكَتْ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَثَرَ الْعَجِينِ فِي يَدَيْهَا فَأَتَى النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سَبْيٌ فَأَتَتْهُ تَسْأَلُهُ خَادِمًا فَلَمْ تَجِدْهُ فَرَجَعَتْ قَالَ فَأَتَانَا وَقَدْ أَخَذْنَا مَضَاجِعَنَا قَالَ فَذَهَبْتُ لِأَقُومَ فَقَالَ مَكَانَكُمَا فَجَاءَ حَتَّى جَلَسَ حَتَّى وَجَدْتُ بَرْدَ قَدَمَيْهِ فَقَالَ أَلَا أَدُلُّكُمَا عَلَى مَا هُوَ خَيْرٌ لَكُمَا مِنْ خَادِمٍ إِذَا أَخَذْتُمَا مَضْجَعَكُمَا سَبَّحْتُمَا اللَّهَ ثَلَاثًا وَثَلَاثِينَ وَحَمِدْتُمَاهُ ثَلَاثًا وَثَلَاثِينَ وَكَبَّرْتُمَاهُ أَرْبَعًا وَثَلَاثِينَ‏.‏