ANSWER:

This hadeeth is authentic. 

If we manage to stay steadfast on Islam in our troubled times and in calamities, we will be highly rewarded.

We won’t surely reach the companions’ patience and commitment but Allah will grant us this reward out of His generosity.

I heard about a hadith where one will receive the reward of 50 sahaba if he/she remains steadfast upon religion. How can we remain steadfast like the sahaba did?