en_tn_condensed/hos/05/05.md

The pride of Israel testifies against him

This describes "pride" as a person who testifies against the people of Israel in court. Their prideful attitude and behavior show that they are guilty of no longer obeying Yahweh.

so Israel and Ephraim will stumble in their guilt; and Judah also will stumble with them

The two kingdoms will become completely disobedient to God because of their pride and sin.