كتاب الصلاة على رسول الله صلى الله عليه وسلم
14  
The Book of Supplicating Allah to Exalt the Mention of Allah's Messenger
(243)
Chapter: The Obligation of Supplicating Allah to Exalt His Mention and its Excellence, and its Manner
(243)
- باب الأمر بالصلاة عليه وفضلها وبعض صيغها
Riyad as-Salihin 1398
Ibn Mas'ud (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said: "The people who will be nearest to me on the Day of Resurrection will be those who supplicate Allah more often for me."

[At-Tirmidhi].

وعن ابن مسعود رضي الله عنه أن رسول الله صلى الله عليه وسلم قال‏:‏ “أولى الناس بي يوم القيامة أكثرهم علي صلاة‏"‏ رواه الترمذي وقال حديث حسن‏.‏
Reference : Riyad as-Salihin 1398
In-book reference : Book 14, Hadith 2