Al Mā’idah

اعْلَمُواْ أَنَّ اللّهَ شَدِيدُ الْعِقَابِ وَأَنَّ اللّهَ غَفُورٌ رَّحِيمٌ

مَّا عَلَى الرَّسُولِ إِلاَّ الْبَلاَغُ وَاللّهُ يَعْلَمُ مَا تُبْدُونَ وَمَا تَكْتُمُونَ

98. "Know that Allah is severe in retribution, and that Allah is forgiving, Merciful."

99. "Nothing is (incumbent) upon the Messenger but to convey (The message of Allah), and Allah knows what you reveal and what you conceal."

Encouragement and threat should be arranged with together. The verse also implies this fact. It says:

You are responsible of your own deeds and the Prophet (S) is not someone who compels you or imposes any domain over you. His duty is only to convey the Message. . So, since the knowledge of Allah encompasses everything, then it is indifferent with Him that you conceal or manifest the things, and your receiving or rejecting the truth does not create any deficiency in the prophet (S).