The covert ... in the house - A canopied seat in the temple for the king and his family when they attended public worship on the sabbath. It stood no doubt in the inner court of the temple.
The king’s entry without - This would seem to have been a private passage by which the king crossed the outer court to the east gate of the inner court when he visited the temple Ezekiel 46:1-2.
Turned he from the house of the Lord for the king of Assyria - This passage is very obscure. Some translate - “altered he in the house of the Lord, because of the kine of Assyria,” supposing the “covert” and the “passage” to have been of rich materials, and Ahaz to have taken them to eke out his “presents to the king of Assyria.” Others render, “removed he into the house of the Lord from fear of the king of Assyria.”