Hisn al-Muslim
The excellence of asking for Allah's blessings upon the Prophet pbuh — Du'a 3
وَقَالَ صلى الله عليه وسلم: ((البَخِيلُ مَن ذُكِرتُ عِندَهُ فَلَم يُصَلِّ عَلَيَّ)).
English meaning
He (PBUH) also said: ‘A miser is one whom when I am mentioned to him, fails to send prayers upon me.