«فَمَا عَلَى التِّبْرِ عَارٌ فِي النَّارِ حِينَ يُقَلَّبُ»
Gold incurs no disgrace when it is turned over in the fire.
Tibr refers to raw or unworked gold; ʿār is shame or disgrace; yuqallab is a passive imperfect verb, “is turned repeatedly.”
The heat of refining does not make gold dishonourable. Likewise, passing through hardship need not diminish a person's worth. The analogy is fire = testing and gold = a valuable character.