bowed his head with his face to the ground ... fell down before Yahweh

These acts of worship that express humility and submission to God. (See: rc://en/ta/man/jit/translate-symaction)

All Judah

Here "Judah" refers to the people from Judah. Alternate translation: "All the people of Judah" (See: rc://en/ta/man/jit/figs-metonymy)