Dedicating your whole duʿāʾ for the ṣalāt on the Prophet ﷺ will alleviate worries and become a means of forgiveness

"When a third of the night had passed, the Messenger of Allah ﷺ stood and said: 'O you people! Remember Allah! Remember Allah! The Rajifah is coming, followed by the Radifah, death and what it brings is coming, death and what it brings is coming!'"

Ubay said that I said, "O Messenger of Allah! I send a lot of Ṣalāt upon you. How much of my Ṣalāt should I make for you?" He said, "As you wish." I said, "˹How about˺ a fourth?" He said, "As you wish, but if do more, it would be better for you." I said, "˹How about˺ one-half?" He said, "As you wish, but if you do more, it would be better for you." I said, "Then ˹how about˺ two-thirds?" He said, "As you wish, but if you do more, it would be better for you."

I said: "Should I make all of my ˹duʿāʾ as˺ Ṣalāt for you?" He said, "˹If you do this˺ it would be sufficient for your concerns and it would be forgiveness for your sins."  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا ذَهَبَ ثُلُثَا اللَّيْلِ قَامَ فَقَالَ: «يَا أَيُّهَا النَّاسُ، اذْكُرُوا اللَّهَ! اذْكُرُوا اللَّهَ! جَاءَتِ الرَّاجِفَةُ، تَتْبَعُهَا الرَّادِفَةُ، جَاءَ الْمَوْتُ بِمَا فِيهِ! جَاءَ الْمَوْتُ بِمَا فِيهِ!»

قَالَ أُبَىٌّ قُلْتُ: يَا رَسُولَ اللَّهِ، إِنِّي أُكْثِرُ الصَّلاَةَ عَلَيْكَ، فَكَمْ أَجْعَلُ لَكَ مِنْ صَلاَتِي؟ 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 صَلاَتِي كُلَّهَا؟ قَالَ: «إِذًا تُكْفَى هَمَّكَ وَيُغْفَرُ لَكَ ذَنْبُكَ۔»