يَنْزِلُ عِيسَى بْنُ مَرْيَمَ , عَلَيْهِ السَّلامُ , فَيَقْتُلُ الْخِنْزِيرَ ، وَيَمْحُو الصَّلِيبَ ، وَتُجْمَعُ لَهُ الصَّلاةُ ، وَيُعْطَى الْمَالَ حَتَّى لا يُقْبَلُ وَيَضَعُ الْخَرَاجَ ، وَيَنْزِلُ الرَّوْحَاءَ فَيَحُجُّ مِنْهَا أَوْ يَعْتَمِرُ أَوْ يَجْمَعُهُمَا
Hazrat Abu Hurairah narrated that : “The Messenger of Allah, May Allah Bless him stated: When Jesus son of Mary descends, he will kill the pig, break the cross, and prayers will be combined…. (Musnad Ahmad)
These signs have already been explained but the sign which is mentioned here is the prayers being combined. It shows that in the time of the Messiah, the amount of work he would be doing for Islam would cause him to even combine the prayers. Another reason for the combining of prayers would be the shortness of time in regards to prayers in many countries around the world.