Ok , this is one of my favorite words. I'd like to add it here.
I 'll post here
some of its meanings , not all, though they may seem a lot.
faithful /adjective
1
-faithful (to sb/sth) staying with or supporting a particular person, organization or belief SYN loyal: a faithful servant / friend / dog .
He remained faithful to the ideals of the party.
She was rewarded for her 40 years' faithful service with the company.
I have been a faithful reader of your newspaper for many years.
2-the faithful noun [pl.] people who believe in a religion; the loyal supporters of a political party:
The president will keep the support of the party faithful.
3-faithful (to sth) true and accurate; not changing anything: a faithful copy / account / description
His translation manages to be faithful to the spirit of the original.
4-[only before noun] able to be trusted; that you can rely on: my faithful old car

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وَمَا يُلَقَّـاهَـا إِلَّا الَّذِينَ صَـبَرُوا وَمَا يُلَقَّاهَا إِلَّا ذُو حَـظٍّ عَظِيمٍ