A person offered `Ishaa’ Salaah and then remembered that they did not perform Maghrib salaah. Is their Salaah valid?

Question 10: A person forgot to make up the missed Maghrib (Sunset) salaah, and offered `Ishaa’ (Night) salaah, after which he remembered the missed Salaah, is his Salaah valid or not? What should he do in this case?

Answer: His `Ishaa’ (Night) Salaah is valid according to the more correct of the two opinions maintained by scholars. There is no blame on him and he is excused by his forgetfulness, for Allaah (Exalted be He) said… read more here.