itayfeder

{
    "criteria": {
        "run": {
            "trigger": "player_hurt_entity",
            "conditions": {
                "damage": {
                    "source_entity": {
                        "nbt": "{SelectedItem:{id:\"minecraft:iron_sword\",tag:{display:{Name:\"Dagger\"}}}}"
                    }
                }
            }
        }
    },
    "rewards": {
        "function": "namespace:function"
    }
}