Reference for Proverbs 30:5

כָּל־אִמְרַ֣ת אֱל֣וֹהַּ צְרוּפָ֑ה מָגֵ֥ן ה֝֗וּא לַֽחֹסִ֥ים בּֽוֹ׃

Every word of God is tried; He is a shield unto them that take refuge in Him.