The Cow - 2:143 So We made you a clear-minded people so that you may be witnesses among the people and the Messenger may be a witness among you. And We changed the Qiblah, which you used to turn towards, to distinguish between those who follow the Messenger and those who turn back on their heels. Surely this is too much for anyone except those whom Allah guides. Allah will not make your faith vain. Allah is Compassionate to mankind, Most Merciful. So We made you a clear-minded people so that you may be witnesses among the people and the Messenger may be a witness among you. And We changed the Qiblah, which you used to turn towards, to distinguish between those who follow the Messenger and those who turn back on their heels. Surely this is too much for anyone except those whom Allah guides. Allah will not make your faith vain. Allah is Compassionate to mankind, Most Merciful.
Questions to the Verse (12)
How does Allah guide?
What is the intention?
The Most Merciful?
Whose deeds will be in vain?
What is Qibla?
Whom does Allah guide?
Whom does Allah not guide?
When is Allah Most Merciful towards His servants?
The most important criterion of belief:
What is the right way?
Related:
Difficult situations/times expose hypocrites and true believers:

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