Psalms 84:3

Yea, the sparrow hath found an house and the swallow a nest for herself, where she may lay her young, brooding them with tender care, the reference being to the fact that small birds were permitted to build their nests within the precincts of the Temple without being disturbed, even Thine altars, O Lord of hosts; my King, and my God. Even as the birds considered the precincts of the Tabernacle their home, to which they always returned with longing and delight, so the singer regards the habitations of the Lord, the great sanctuaries of the people, as his home on earth and longs to return there, to find both protection and food in his fellowship with God.