﴿ هُنَالِكَ ٱبْتُلِىَ ٱلْمُؤْمِنُونَ وَزُلْزِلُوا۟ زِلْزَالًۭا شَدِيدًۭا ﴾

“[for] there and then were the believers tried, and shaken with a shock severe.”

it was there that the believers were sorely tried there they were tested to distinguish the sincere individual from the one otherwise and were shaken with a mighty shock because of the severity of the terror.