NET
26 Although it grieved the king deeply, he did not want to reject her request because of his oath and his guests.
Darby
26 And the king, [while] made very sorry, on account of the oaths and those lying at table with [him] would not break his word with her.
KJV
26 And the king was exceeding sorry; [yet] for his oath's sake, and for their sakes which sat with him, he would not reject her.