كتاب العلم
13
The Book of Knowledge
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)‏‏)‏
Sunnah.com reference : Book 13, Hadith 4
Arabic/English book reference : Book 13, Hadith 1379