Sahih Muslim | Book 21 | Chapter 8
Narrated by Ibn Abu Aufa
Ibn Abu Aufa reported: We went on seven expeditions with Allah's Messenger (may peace be upon him) and ate locusts.
Narrated by Abu Ya'fur
This hadith has been narrated on the authority of Abu Ya'fur with the same chain of transmitters. Abu Bakr (one of the narrators) said "seven expeditions," whereas Ishaq said "six," and Ibn Umar said "six" or "seven".