The Messenger of Allah (ﷺ) said: A person who sees a person in danger, then says:

اَلْحَمْدُ لِلَّهِ الَّذِي عَافَانِي مِمَّا ابْتَلَاكَ بِهِ، وَفَضَّلَنِي عَلَى كَثِيرٍ مِمَّنْ خَلَقَ تَفْضِيلًا

Alhamdu lillaahil-lathee 'aafaanee mimmab-talaaka bihi wa fadhdhalanee 'alaa katheerin mimman khalaqa tafdheela

Praise is to Allah Who has spared me what He has afflicted you with, and preferred me greatly above much of what He has created. That danger will not touch him.

Reference: Sahih. Tirmidhi: 3432