Is the witness's failure to mention a specific matter—given his forgetting the exact wording of the oath, "without addition or omission," and his keenness not to lie—considered a breach of the oath he swore: "I swear by Almighty God to tell the truth, without addition or omission"?
As long as you forgot the oath you swore, there is no sin upon you and no expiation. This is the view of the majority of scholars. It is stated in the book Asna al-Matalib: "One who forgets his oath does not break it... in that what he did is what was sworn upon."
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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