Musar על יומא 153:7

Our sages of blessed memory already expounded on the verse: "I have come because of your words" (Daniel 10:12) - "that Gavriel was not allowed to re-enter behind the heavenly curtain until he had pleaded in defense of Israel" (Yoma 77a). And on Gideon it was said "go in with your might" (Shoftim 6:14) - "because he pleaded in defense of Israel" (Yalkut Shimoni 247:62).