Hadith 223

-- The Prophet (SAW) said: "No one sends greetings (or prayers of peace) upon me but Allah returns my soul to me so that I may return his greetings." Reference: Abu Dawud (no. 2041). Al-Albani graded it good in Sahih Abu Dawud 1/383.

وَقَالَ صلى الله عليه وسلم: (مَا مِنْ أَحَدٍ يُسَلِّمُ عَلَيَّ إِلاَّ رَدَّ اللَّهُ عَلَيَّ رُوحِيَ حَتَّى أَرُدَّ عَلَيْهِ السَّلاَمَ)

Reference: 1522230
In-book reference: Book 1, Hadith 223