Or HaChaim on Numbers 14:27/אור החיים על במדבר י״ד:כ״ז

1 עד מתי לעדה הרעה הזאת, "How long will this evil congregation, etc." The "evil congregation" referred to here are the ten spies. This view is confirmed by Sanhedrin 108. G'd continues: את תלונות בני ישראל; this is a reference to the rest of the people. The words עד מתי imply that even now the spies were still exerting their evil influence on the people preventing them from identifying with G'd. This is the reason that G'd calls these ten men עדה רעה, an evil congregation. When G'd says אשר המה מלינים עלי, He underlines that not only are these people wicked themselves but they attempt to turn the Israelites into wicked people.

2את תלונות בני ישראל שמעתי, "I have heard the complaints against Me by the children of Israel." It was necessary to inform us that G'd heard, i.e. He only heard the complaints of the Israelites, not the wicked words of the spies. The meaning of the verse is as follows: "The complaints of the Israelites which have been inspired by the spies I have heard, whereas I have not listened to the spies who have inspired these complaints." The words of the spies were so despicable that G'd did not even want to consider if there was any basis for them that He could find an excuse for.