It was their faith in Jehovah and their trust in his dealings with them. They did not focus just on themselves and their personal comfort.
فَقَدْ آمَنُوا بِيَهْوَهَ ،‏ وَثِقُوا بِهِ ،‏ وَلَمْ يُفَكِّرُوا فَقَطْ فِي أَنْفُسِهِمْ أَوْ رَاحَتِهِمْ .‏