Sforno on Numbers 14:27/ספורנו על במדבר י״ד:כ״ז

1?עד מתי לעדה הרעה הזאת, even though I have forgiven them in accordance with your own stipulation not to decree immediate death for them, instead of letting all of them die already now, I did not include the actual spies themselves in this partial forgiveness. אשר המה מלינים עלי, seeing they were the ones who orchestrated the people slandering Me. They are directly responsible for the sin committed by the multitude. They do not deserve any extension of their lives, I will punish them immediately; concerning them I utter an oath