(50) باب الْمَرْءُ مَعَ مَنْ أَحَبَّ
Anas b. Malik reported that a desert Arab said to Allah's Messenger (ﷺ):
When would be the Last Hour? Allah's Messenger (ﷺ) said: What preparation have you made for that? Thereupon he said: The love of Allah and of His Messenger (that is my preparation for the Last Hour) (for the Day of Resurrection). Thereupon he (the Holy Prophet) said: You would be along with one whom you love.
Reference: Sahih Muslim 2639 a
In-book reference: Book 45, Hadith 206
USC-MSA web (English) reference(deprecated numbering scheme): Book 32, Hadith 6378