Hadith 31-230

وَبِإِسْنادِهِ قالَ: قالَ النَّبِيّ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: لا تَقُومُ السَّاعَة حَتّى‏ يَقُومُ قائِمٌ لِلْحَقِّ مِنَّا، وَذلِكَ حِينَ يَأذَنُ اللَّه عَزَّ وَجَلَّ لَهُ، وَمَن تَبِعَهُ نَجا، وَمَن تَخَلَّفَ عَنْهُ هَلَكَ، اللَّه اللَّه عِبادَ اللَّهِ فَأَتُوهُ وَلَوْ عَلَى الثَّلجِ، فَإِنَّهُ خَلِيفَةُ اللَّهِ عَزَّ وَجَلَّ وَخَلِيفَتِي.

According to the same documentation, the Prophet (S) said, “The Hour will not come unless the Rightful Riser from us will rise. That is when God grants him permission to do so. Whoever follows him will be saved, but whoever opposes him will be destroyed. O servants of God! Remember God! Go towards him even if he is on snow or ice as he is the Representative of the Honorable the Exalted God on Earth.”