I said: O Messenger of Allah, I often send salah upon you, so how much of my supplication should I make for you? He said: Whatever you wish. I said: A quarter? He said: Whatever you wish, and if you increase, it is better for you. I said: Half? He said: Whatever you wish, and if you increase, it is better for you. I said: Two thirds? He said: Whatever you wish, and if you increase, it is better for you. I said: Should I make all of my supplication for you? He said: Then your worries will be taken care of, and your sin will be forgiven.
قُلْتُ: يَا رَسُولَ اللَّهِ، إِنِّي أُكْثِرُ الصَّلَاةَ عَلَيْكَ، فَكَمْ أَجْعَلُ لَكَ مِنْ صَلَاتِي؟ فَقَالَ: مَا شِئْتَ. قَالَ: قُلْتُ: الرُّبُعَ؟ قَالَ: مَا شِئْتَ، فَإِنْ زِدْتَ فَهُوَ خَيْرٌ لَكَ. قُلْتُ: النِّصْفَ؟ قَالَ: مَا شِئْتَ، فَإِنْ زِدْتَ فَهُوَ خَيْرٌ لَكَ. قَالَ: قُلْتُ: فَالثُّلُثَيْنِ؟ قَالَ: مَا شِئْتَ، فَإِنْ زِدْتَ فَهُوَ خَيْرٌ لَكَ. قُلْتُ: أَجْعَلُ لَكَ صَلَاتِي كُلَّهَا؟ قَالَ: إِذًا تُكْفَى هَمَّكَ، وَيُغْفَرُ لَكَ ذَنْبُكَ.