“Whoever helps a believer with a hardship from the hardships of this life, Allaah will help him...”
This is an example of the reward being similar to the deed and the texts are numerous in this regard such as the statement of the Prophet :
“Allah only shows mercy to those of His servants who are merciful.”
The Arabic word “Kurbah” used in the Hadith is any severe hardship that places the person into great difficulty. The word “Naffasa” or help, relief is to lessen and decrease some of the burden of such a hardship. The word is derived from the same root as the Arabic word for “breathe” such that when the throat is tight or constricted, its only reprieve is to assist in opening the airway.
As for the word “Farraja", it is greater in that it means to actually remove the hardship from a believer.
So by doing this, you remove his hardship and thereby relieve his distress and worry. So the reward for helping and relieving (a believer’s hardships) is help and relief (from Allah), and the reward for removing it is likewise removal (of a hardship by Allah) as in the Hadith of Ibn Umar.
Whoever Helps A Believer With A Hardship
...Hardship From The Hardships Of The Day Of Resurrection
Whoever Shows Leniency Towards Someone In Difficultly, Allah Will Show Him Leniency In This Life And The Hereafter
Whoever Conceals (the Faults Of) A Muslim, Allah Will Conceal Him In This Life And The Hereafter
And Allah Will Continue To Aid The Servant As Long As The Servant Aids His Brother
Whoever Pursues A Path Seeking Knowledge, Allaah Will Make The Path To Paradise Easy For Him
No Group Of People Gather In One Of The Houses (mosques) Of Allah Reciting The Book Of Allah And Studying It Amongst Themselves, Except That Tranquillity Will Descend Upon Them, Mercy Will Cover Them, The Angels Will Surround Them, And Allah Will Mention Them To Those With Him
And Whoever Is Prevented By His Deeds Will Not Be Hastened Forward By His Lineage