Helaman 4:21

yea, they began to remember the prophecies of Alma, and also the words of Mosiah; and they saw that they had been a stiffnecked people, and that they had set at nought the commandments of God;

They began to remember what Alma had said. They also remembered Mosiah’s words. They saw that they had been stubborn people. They had ignored God’s rules.

They began remembering Alma’s prophecies and Mosiah’s words. They realized they’d been stubborn and had ignored God’s commands.