اشتروا بآيات الله ثمنا قليلا فصدوا عن سبيله إنهم ساء ما كانوا (9:9) بالانجليزي

(9:9) They bartered away Allah's revelations for paltry worldly gains *12 and then debarred others from His Way: *13 indeed very evil were the deeds they did.

Tafseer Abu-al-A'la Maududi

Page 188 English Traditional

*12) That is, "When they had to make a choice between the Divine Guidance and the transitory worldly ambitions, they chose the latter, because they did not comprehend the comparative values of the two. Whereas the Revelations of Allah were inviting them to goodness, righteousness and observance of the Divine Law, which lead to eternal bliss, they chose to follow the unbridled lusts of their selves which gained some transitory worldly benefits for them, but consequently led them to eternal perdition.
*13) Those evil-doers "blocked His Way for others", for they not only chose misguidance for themselves but also tried to prevent others from following the right way. They put every kind of obstruction in the way of the invitation to righteousness; nay, they tried their worst to gag the mouths of those who were extending that invitation and make their lives hard for them. In short, they did all they could to prevent the establishment of the righteous system of life that Allah required the people to establish.