Riyad as-Salihin 1379
Sahl bin Sa'd (May Allah be pleased with him) reported:
The Prophet (ﷺ) said to 'Ali (May Allah be pleased with him), "By Allah, if a single person is guided by Allah through you, it will be better for you than a whole lot of red camels." [Al-Bukhari and Muslim] .
وعن سهل بن سعد رضي الله عنه أن النبي صلى الله عليه وسلم قال لعلي رضي الله عنه ‏:‏ ‏
"‏فوالله لأن يهدي الله بك رجلا واحدا خير من حمر النعم‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏