And Allah Most High said:
“Such is the punishment; but the punishment of the Hereafter is greater.”
Surah al-Qalam, 33
And He said:
“We will punish them twice; then they will be returned to a tremendous punishment.”
Surah al-Tawbah, 101
And He said:
“We will surely make them taste the lesser punishment before the greater punishment, so that they may return.”
Surah al-Sajdah, 21
And He said:
“Then watch for the Day when the sky brings forth a clear smoke.”
Surah al-Dukhān, 10
Through to His words:
“On the Day We strike with the greatest blow, We will surely exact retribution.”
Surah al-Dukhān, 16
For this reason, in most surahs that convey warnings, Allah mentions both the punishment He inflicted upon evildoers in this world and what He has prepared for them in the Hereafter. A surah may mention only what is promised in the Hereafter, for its punishment is greater and its reward is greater, and it is the everlasting abode. Whatever reward and punishment in this world He mentions is mentioned only secondarily.
For example, He says in the account of Joseph:
“Thus We established Joseph in the land, to settle wherever he wished. We bestow Our mercy on whom We will, and We do not let the reward of