Rashi on Genesis 24:50/רש"י על בראשית כ״ד:נ׳

1ויען לבן ובתואל THEN LABAN AND BETHUEL ANSWERED —He (Laban) was a wicked person and so rushed in to answer before his father.

2לא נוכל דבר אליך WE CANNOT SPEAK UNTO THEE — refusing this proposition either by answering you with unpleasant words (i. e. a flat refusal) or by giving you a reasoned reply, for it is evident that the matter proceedeth from the Lord since, according to your statement, He brought her and you together.