Shared ground

These two verses describe a vow of praise made directly to God. The speaker expects God’s help and promises an appropriate response: a “new song” sung with instrumental accompaniment. That praise is not presented as vague optimism; it is tied to a specific conviction about God’s character and actions.

The text explicitly claims that God “gives salvation/deliverance to kings” and that God “rescues David, his servant, from the deadly sword” (Psalm 144:9–10). The king’s survival is described as something received from God, not achieved by the king alone.

Where interpretation differs (only where needed)

What “new song” means. Some take it mainly as new words or a newly composed piece. Others take it as older worship language meaning “fresh praise for a fresh act of help,” even if the style resembles earlier songs.

How broad the claim about kings is. Some read “gives deliverance to kings” as a general principle: God is the decisive source of royal security. Others read it more narrowly as the speaker’s immediate situation: this king (David or a David-like ruler) is celebrating the God who is currently saving him.

Whether “deadly sword” is literal or broader. Some understand it as literal military threat. Others allow it to function as a vivid image for mortal danger more generally, while still fitting a war-and-kings setting.

Why the disagreement exists The phrases are poetic and compact. “New song” is used elsewhere in the Psalms as a standard way to mark a major act of rescue, which can point either to new content or to new occasion. “Gives deliverance to kings” sounds like a wide claim, but it sits next to a concrete memory about David, which can pull interpretation toward a specific historical deliverance. “Sword” naturally evokes warfare, yet poetry often uses concrete threats as shorthand for life-and-death danger.

What this passage clearly contributes These verses connect worship to remembered rescue: praise is promised because God is understood to be the one who saves rulers and preserves David, called God’s servant. Explicitly, the text presents God as the giver of deliverance and the rescuer from lethal threat. By implication (but not by direct statement), it portrays public praise and music as fitting responses when a community’s leader is preserved and a crisis is reversed.