وَلَقَدْ يَسَّرْنَا ٱلْقُرْءَانَ لِلذِّكْرِ فَهَلْ مِن مُّدَّكِرٍ
The fourth and last full occurrence of the refrain. Behind it are four accounts: Noah, ʿĀd, Thamūd, Lot.
And this is the sūra's last wa-laqad yassarnā. After it the fifth account will come, but it will not close with the refrain.