Comfort and Redemption

Simeon

From שמע >> “The Listening/Obedient One”

righteous and holy

there is an implied eimi verb; προσδεχόμενος modifies the implied verb TRP CC MM. Simeon’s expectation could describe what his righteousness and devoutness looked like (participle of manner — descriptive), how he carried out his righteousness (participle of means), and/or why he can be described as righteous and devout (causal participle — he was righteous and devout because he was expecting the comfort of Israel)

These three possibilities overlap significantly: this sentence is saying that Simeon’s hopeful expectation was the substance of his righteous piety.