Translation:

8. Of the people there are some who say: "We believe in Allah and the Last Day" but they do not (really) believe.

Notes (Tafseer)

33. We now come to a third class of people, the hypocrites. They are untrue to themselves, and therefore their hearts are diseased (ii. 10). The disease tends to spread, like all evil. They are curable but if they harden their hearts, they soon pass into the category of those who deliberately reject light.