Gideon's Fleece
A fleece on the threshing floor at night, and the dew on it alone. Scroll to watch it.
If Thou wilt save Israel by mine hand, O Lord, as Thou hast said, behold I will put a fleece of wool on the threshing-floor, and if there shall be dew on the fleece and dryness on all the ground, I shall know that Thou wilt deliver the people by my hand according to Thy promise. And it was so.
Judges 6:36-38, as St Ambrose of Milan gives it
He shall come down like the rain into a fleece of wool, and like the drop which distills upon the earth
Psalm 72:6, as St John Chrysostom gives it
And David signifying His incarnate presence said “He shall come down like the rain into a fleece of wool, and like the drop which distills upon the earth” because He noiselessly and gently entered into the Virgin’s womb.
John Chrysostom, Homily on “Father, if it be possible” 3