Mujahid (may Allah have mercy on him) said regarding the statement of Allah, the Mighty and Majestic: ﴿And whoever among you kills it intentionally﴾: What is meant is the person who intentionally kills the animal but has forgotten that he is in the state of ihram; it is this person upon whom the ruling of expiation will apply.
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 828
Hadith Gradingمحدثین:سنده صحيح.
Hadith Takhrij«أخرجه سعيد بن منصور فى (سننه) برقم: 828، وعبد الرزاق فى (مصنفه) برقم: 8173، 8174»