Psalm 48:3-4 New English Translation

³God is in its fortresses;
he reveals himself as its defender.^[a]
⁴For^[b] look, the kings assemble;^[c]
they advance together.

Psalm 48:3 tn Heb “its elevated place,” or “its refuge.”
Psalm 48:4 tn The logical connection between vv. 3-4 seems to be this: God is the protector of Zion and reveals himself as the city’s defender—this is necessary because hostile armies threaten the city.
Psalm 48:4 tn The perfect verbal forms in vv. 4-6 are understood as descriptive. In dramatic style (note הִנֵּה, hinneh, “look”) the psalm describes an enemy attack against the city as if it were occurring at this very moment. Another option is to take the perfects as narrational (“the kings assembled, they advanced”), referring to a particular historical event, such as Sennacherib’s siege of the city in 701 b.c. (cf. NIV, NRSV). Even if one translates the verses in a dramatic-descriptive manner (as the present translation does), the Lord’s victory over the Assyrians was probably what served as the inspiration of the description (see v. 8).

New English Translation (NET)