Génesis 29:25 Comentario: Rashi, Chizkuni, Da'at Zekenim & Rashbam

ויהי בבקר והנה הוא לאה AND IT CAME TO PASS, THAT IN THE MORNING, BEHOLD, IT WAS LEAH —But at night it was not Leah (i. e. he failed to recognise that it was Leah) because Jacob had given Rachel certain secret signs by which they could at all times recognise one another, and when Rachel saw that they were about to bring Leah to him for the marriage ceremony, she thought, “My sister may now be put to shame”, and she therefore readily transmitted these signs to her (Megillah 13b).

ויהי בבקר והנה היא לאה, “and when it was morning Yaakov found out that the woman in bed with him had been Leah;” this verse teaches us a great deal about how chaste a person Yaakov was, and that he had hardly exchanged any words with who he thought was his wife while having marital relations with her. Had he been speaking with her, surely he would have known from her voice that he had been deceived. After all, he had lived in her proximity for the last seven years, and she was no stranger to him. If you were to ask that seeing that the so called marriage ceremony was clearly invalid, as the woman under the wedding canopy had not been the one with whom he thought that he had exchanged sacred vows, we would have to answer that as soon as he found this out he had relations with her for the purpose of legalising their marriage.

ויהי בבוקר, “when it had become morning, etc.” during the entire night Leah had pretended to be Rachel, using three different items to identify herself as her sister, which Rachel had received from Yaakov, one had to do with the laws of menstruation, the second one with the laws of challah, and the third one with the lighting of candles on Friday night. We are told the following in B’reshit Rabbah 70,19: all night long people were singing what sounded like the praises of Leah, sort of hinting to Yaakov that he was being swindled. Yaakov, who had no reason to fear that the town’s people wished him ill, did not suspect being tricked when Leah always answered when he addressed her as Rachel. In the morning when he found out that he had been tricked by Leah, and he complained to her, she responded that she had learned from him to do this, as when Yitzchok had asked him if he was his firstborn son Esau, he had answered in the affirmative. This is when Yaakov began to hate her as is reported in verse 31, where G–d is reported as taking note of that. Yitzchok himself had told Esau that his brother had tricked him.