Thou coveredst it with the deep as with a garment: the waters stood above the mountains. Thou coveredst it with the deep - This seems to be spoken in allusion to the creation of the earth, when it was without form and void, and darkness was upon the face of the deep, and the waters invested the whole, till God separated the dry land from them; thus forming the seas and the terraqueous globe.
The poet Ovid has nearly the same idea: -
Densior his tellus, elementaque grandia traxit,
Et pressa est gravitate sua; circumfluus humor
Ultima possedit, solidumque coercuit orbem.
Met. lib. i., ver. 29.
Earth sinks beneath, and draws a numerous throng
Of ponderous, thick, unwieldy seeds along:
About her coasts unruly waters roar;
And, rising on a ridge, insult the shore.
Dryden.