“If you are truthful, then cause fragments from the sky to fall on us.”
Sayyed Abbas Sadr-Ameli
Therefore cause a piece of the sky to fall on us, if you are one of the truthful
Al-muntakhab fi tafsir al-Qur'an al-Karim
"And if you are not, and you are indeed declaring the truth, then let us see if you can cause a piece of heaven to fall upon us in the form of discs of cumuli"