Reference for Chullin 202:21

והלא לא נאמר אלא בני ישראל ולא נקראו בני ישראל עד סיני

It is written: And the sons of Israel carried Jacob their father!<span class="x" onmousemove="('comment',' Ibid. XLVI,5. The reference is to the children of Jacob carrying their father to Egypt; thus they are styled 'the children of Israel' before the giving of the Law at mount Sinai.');">¹²</span>

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