Genesis 8:10-12

(10-12) Again he sent forth the dove... — When, after another week’s delay, Noah again sent forth the dove, it remained away until “the time of evening,” finding both food and ground on which it could alight near the ark. It was not till nightfall that it came home, bringing to him “an olive leaf pluckt off,” or, possibly, a fresh olive-leaf. The olive-tree, which grows abundantly in Armenia, is said to vegetate under water; but what Noah wanted to learn was, not whether the topmost boughs were emerging from the flood, but whether the soil beneath was becoming free from water. Now, after a seven days’ interval, when Noah again sent forth the dove, she did not return, “because the ground was dry.” It is thus plain that the olive-tree had had plenty of time on some of the higher lands, while the flood was subsiding, to put forth new leaves. From this event the olive-leaf, thus sent by the regenerated earth to Noah in proof that she was ready to yield herself to him, has been ever since, among all mankind, the symbol of peace.