1 Kings 18:42

Elijah went up to the top of Carmel; where he might secretly and ardently pour out his prayers unto God; and whence he might look towards the sea, and discern when the rain was coming. Put his face between his knees; he either sat, or rather kneeled upon his knees, and then cast down his face to the ground between his knees; either in token of profound reverence and humility, or out of fervency of spirit, which oft disposeth men to uncouth gestures, which at other times, or in other men, would be ridiculous; but in them, and in that case, are usual and allowed: or, that turning away his eyes from all outward objects, he might be more intent and earnest upon his work, or pray to God without distraction.