Supplication

Upon seeing someone going through a trial or tribulation

3 duas with Arabic, transliteration and translation.

Upon seeing someone going through a trial or tribulation - 1

الْحَمْـدُ للهِ الّذي عافاني مِمّا ابْتَـلاكَ بِهِ، وَفَضَّلَـني عَلى كَثيـرٍ مِمَّنْ خَلَـقَ تَفْضـيلا

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.

Ibn Majah: 3892, At-Tirmidhi: 3431, 3432

Upon seeing someone going through a trial or tribulation - 2

الْحَمْـدُ للهِ الّذي عافاني مِمّا ابْتَـلاكَ بِهِ، وَفَضَّلَـني عَلى كَثيـرٍ مِمَّنْ خَلَـقَ تَفْضـيلا

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.

Ibn Majah: 3892, At-Tirmidhi: 3431, 3432

Upon seeing someone going through a trial or tribulation - 3

الْحَمْـدُ للهِ الّذي عافاني مِمّا ابْتَـلاكَ بِهِ، وَفَضَّلَـني عَلى كَثيـرٍ مِمَّنْ خَلَـقَ تَفْضـيلا

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.

Ibn Majah: 3892, At-Tirmidhi: 3431, 3432

Each dua is shown with its reference where the source records one, so you can check it. Duas whose wording you intend to rely on in worship are worth confirming with a qualified teacher.