Allah Said to Prophet Muhammad(pbuh) In Quran :
this is the glad tidings that allah gives to his worshipers, who believe and do good works. 
say: 'for this i ask you no wage except the love of the (prophet's) relatives.
we will add good to whosoever gains a good deed. allah is the forgiving and the thanker. '
Quran - ASH-SHURA - 23

ذَلِکَ الَّذِی یُبَشِّرُ اللَّهُ عِبَادَهُ الَّذِینَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ 
قُل لَّا أَسْأَلُکُمْ عَلَیْهِ أَجْرًا إِلَّا الْمَوَدَّةَ فِی الْقُرْبَى 
وَمَن یَقْتَرِفْ حَسَنَةً نَّزِدْ لَهُ فِیهَا حُسْنًا إِنَّ اللَّهَ غَفُورٌ شَکُورٌ ﴿۲۳﴾

Then , Why did Kofies -who invited Imam Hussain to help theme- Martyr him ?
how did they (Kofies) wage Prophet Muhammad?

'Oh Imam Hussain !
May my father and mother be sacrificed for you.
Surely my sorrow for you is great and I pray to Allah who has honoured your status and has also honoured me through you that He grant me the opportunity to seek your revenge with the victorious Imam from the family of Muhammad.

#Who_is_Husayn #Muharram #Ashura_In_Iran #Aşura #Ash