In the courts of the Lord's house - See the notes at Psalm 65:4. Compare Psalm 84:2; Psalm 92:13; Psalm 96:8; Psalm 100:4; Psalm 135:2.
In the midst of thee, O Jerusalem - Where the tabernacle, and afterward the temple, was reared.
Praise ye the Lord - Hallelujah. A call on others to join in the praise of God. The psalmist felt his own heart drawn to the service of praise by all the mercies of God; he desired, as an expression of his own feelings, that others should unite with him in that sacred exercise. When our own hearts are filled with gratitude, we wish that all others may partake of the same feeling.

In the midst of thee, O Jerusalem - He speaks as if present in the city, offering his vowed sacrifices in the temple to the Lord.
Most of this Psalm has been applied to our Lord and his Church; and in this way it has been considered as prophetic; and, taken thus, it is innocently accommodated, and is very edifying. This is the interpretation given of the whole by the old Psalter.

In the courts of the Lord's house,.... This is added by way of explanation of Psalm 116:18, what he meant by "the presence of all his people"; the assembly of the saints met together in the house of the Lord, at the door of the tabernacle, in the courts of it, where the people got together to worship God;
in the midst of thee, O Jerusalem; the Lord's house or tabernacle; for as yet the temple was not built, and the courts of it were in the midst of the city of Jerusalem. And this shows, as some interpreters have observed, that this psalm must have been written after David came to the kingdom, and had got this city into his hands, whither he brought the ark of the Lord. The whole signifies that he would praise the Lord publicly, as well as privately; and he concludes the psalm thus,
Praise ye the Lord; calling upon the Lord's people, in his house and courts, to join with him in this work of praise.