Hence, when the Qur'an is voiced, hearken unto it, and listen in silence, so that you might be graced with [God's] mercy."

When the Qur'an is read, listen to it with attention, and hold your peace: that ye may receive Mercy.

And when the Qur'an is recited, give ear to it and pay heed, that ye may obtain mercy.

And when the Qur'an is recited, listen to it and remain silent, that mercy may be shown to you.

So when the Qur'an is recited, then listen to it and pay attention that you may receive mercy.