2 Kings 16:10

And king Ahaz went to Damascus to meet Tiglath-pileser king of Assyria, and saw an altar that was at Damascus: and king Ahaz sent to Urijah the priest the fashion of the altar, and the pattern of it, according to all the workmanship thereof.

Ahaz went to Damascus to meet Tigiath-pileser. This was a visit of respect, and perhaps of gratitude. It was the first time, in all probability, that Ahaz and his courtiers had come into contact with the mighty lord-paramount, and yet, although many scenes must have been witnessed in the Assyrian camp, betokening the pomp and circumstance of the great conqueror, one incident only has been put on record, evidently from its being regarded by the sacred historian as being of an idolatrous character. This is expressly stated in the parallel passage (2 Chronicles 28:3). Besides, the Assyrian conquerors required all their tributaries to set up in their capitals altars to the great gods, as a token of gratitude, on the part of the victor, to the deities by whose favour he had triumphed, and a badge of subjection to their suzerain on the part of the dependents. During his stay that pagan city, Ahaz saw an altar with which he was greatly captivated. Forthwith a sketch of it was transmitted to Jerusalem, with orders to Urijah the priest to get one constructed according to the Damascus model, and to let this new altar supersede the old one in the temple.