Tafsir of Al-Muzzammil 73:15-19

15

The address now turns to the disbelievers of Makkah, who were denying the Holy Prophet (upon whom be peace) and persecuting him relentlessly.

16

Sending the Holy Prophet to be a witness over the people also means that he should testify to the Truth by his word and deed before them in the world and also that in the Hereafter when Allah's Court is established, he will testify that he had presented the whole Truth before the people in the world. (For further explanation, see E.N. 144 of Al-Baqarah, E.N. 64 of An-Nisa', An-Nahl: 84, 89, E.N. 82 of Al-Azab, E.N. 14 of Al-Fath).

17

That is, "In the first place, you should be afraid that if you do not accept the invitation of the Messenger sent by Us, you will have to meet the same evil end in this world, which the Pharaoh has already met in consequence of this very crime. But even if no torment is sent on you in the world, how will you save yourselves from the punishment of the Day of Resurrection?"