From Sahih Bukhari (Hadith 5453):
Narrated Jabir bin `Abdullah:We were with Allah's Messenger (ﷺ) collecting Al-Kabath at Mar-Az-Zahran. The Prophet (ﷺ) said, "Collect the black ones, for they are better." Somebody said, (O Allah's Messenger (ﷺ)!) Have you ever shepherded sheep?" He said, "There has been no prophet but has shepherded them
Reference: Bukhari 5453