וְרִבְקָה֙ אָֽמְרָ֔ה אֶל־יַעֲקֹ֥ב בְּנָ֖הּ לֵאמֹ֑ר הִנֵּ֤ה שָׁמַ֙עְתִּי֙ אֶת־אָבִ֔יךָ מְדַבֵּ֛ר אֶל־עֵשָׂ֥ו אָחִ֖יךָ לֵאמֹֽר׃
Sprach Rebekka zu ihrem Sohne Jakob: Siehe, ich habe deinen Vater zu deinem Bruder Esau reden hören:
Or HaChaim on Genesis
ורבקה אמרה אל יעקב, And Rebeccah said to Jacob, etc. The reason that the Torah introduces the verse with the conjunctive letter ו is to tell us that Rebeccah agreed with the Holy Spirit which had conveyed this conversation between Isaac and Esau to her.
Radak on Genesis
ורבקה..לאמר, she had a conversation with her son Yaakov, at the end of which she told him that his father had sent out Esau to bring him venison as a prelude to receiving the blessing.
Or HaChaim on Genesis
לאמר, הנה שמעתי. to say, "here I have heard," etc. She wanted to make sure that Jacob realised that she had only just become aware of what had transpired between Isaac and Esau and that she could not be accused of having allowed too much time to elapse to take countermeasures. Jacob had enough time to carry out his mother's instructions.