Abu Said al-Khudri reported that the Prophet ﷺ said: "If any Muslim does not have anything to give as sadaqah, he should say in his dua:

O Allah, bless Muhammad, Your slave and Your Messenger and bless the believers, both men and women, and the Muslims, both men and women.

That will be sadaqah for him."

عَنِ النَّبِيِّ ﷺ قَالَ: «أَيُّمَا رَجُلٌ مُسْلِمٌ لَمْ يَكُنْ عِنْدَهُ صَدَقَةٌ فَلْيَقُلْ فِي دُعَائِهِ:

اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ عَبْدِكَ وَرَسُولِكَ وَصَلِّ عَلَى الْمُؤْمِنِينَ وَالْمُؤْمِنَاتِ وَالْمُسْلِمِينَ وَالْمُسْلِمَاتِ

فَإِنَّهَا لَهُ زَكَاةٌ»

from the Prophet ﷺ who said, "If anyone says:

O Allah, bless Muhammad and the family of Muhammad as You blessed Ibrahim and the family of Ibrahim. Shower blessings on Muhammad and the family of Muhammad as You showered blessings on Ibrahim and the family of Ibrahim. Show mercy to Muhammad and the family of Muhammad as You showed mercy to Ibrahim and the family of Ibrahim.

I will testify for him on the Day of Rising and I will intercede for him."

عَنِ النَّبِيِّ ﷺ قَالَ: «مَنْ قَالَ:

اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ، كَمَا صَلَّيْتَ عَلَى إِبْرَاهِيمَ وَآلِ إِبْرَاهِيمَ، وَبَارِكْ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ، كَمَا بَارَكْتَ عَلَى إِبْرَاهِيمَ وَآلِ إِبْرَاهِيمَ، وَتَرَحَّمْ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ، كَمَا تَرَحَّمْتَ عَلَى إِبْرَاهِيمَ وَآلِ إِبْرَاهِيمَ

شَهِدْتُ لَهُ يَوْمَ الْقِيَامَةِ بِالشَّهَادَةِ وَشَفَعْتُ لَهُ»

The Prophet ﷺ went out to open ground to answer a call of nature and did not find anyone to follow him. Umar went out and followed him with a clay pot or wudu vessel. He found him prostrating in a river bed. 

He fell back and sat behind him until the Prophet ﷺ lifted his head. He said: “You have done well, Umar. When you found me prostrating, you went behind me. Jibril came to me and said: If someone sends the salawat on you once, Allah will send blessings upon ten times on him and raise him ten degrees.”

أَنَّ النَّبِيَّ ﷺ خَرَجَ يَتَبَرَّزُ فَلَمْ يَجِدْ أَحَدًا يَتْبَعُهُ فَخَرَجَ عُمَرُ فَاتَّبَعَهُ بِفَخَّارَةٍ أَوْ مِطْهَرَةٍ فَوَجَدَهُ سَاجِدًا فِي مِسْرَبٍ فَتَنَحَّى 

فَجَلَسَ وَرَاءَهُ حَتَّى رَفَعَ النَّبِيُّ ﷺ رَأْسَهُ فَقَالَ: «أَحْسَنْتَ يَا عُمَرُ، حِينَ وَجَدْتَنِي سَاجِدًا فَتَنَحَّيْتَ عَنِّي، إِنَّ جِبْرِيلَ جَاءَنِي فَقَالَ: مَنْ صَلَّى عَلَيْكَ وَاحِدَةً صَلَّى اللَّهُ عَلَيْهِ عَشْرًا وَرَفَعَ لَهُ عَشْرَ دَرَجَاتٍ»

from the Prophet ﷺ who said: "If anyone sends salawat on me once, Allah sends blessings upon him ten times and removes ten sins from him."

عَنِ النَّبِيِّ ﷺ قَالَ: «مَنْ صَلَّى عَلَيَّ وَاحِدَةً صَلَّى اللَّهُ عَلَيْهِ عَشْرًا وَحَطَّ عَنْهُ عَشْرَ خَطِيئَاتٍ»