Commentary for Arakhin 4:2
חד קרבנו ולא קרבן אביו ואידך לרבות כל בעלי חוברין לסמיכה
so that two more would remain redundant, from one of which he would infer that 'his offering' means 'but not that of his father', and from the other that all who have a share in the ownership of a sacrifice are obliged to perform the laying on of hands.
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