You may be excused for thinking that Isaiah 56:1 sounds a bit Islamic. God tells his people, “Maintain justice and do righteousness”.
Islam teaches that a Muslim earns Allah’s favour by doing good deeds and keeping the five pillars of Islam – testimony, prayer, alms-giving, fasting, and taking a pilgrimage to Mecca. You do righteousness in order to hopefully be righteous. Is this what Isaiah is teaching?