Before the Revelation, he was called ‘Al-Ameen’ the truthful, because he was well known for never telling lies or tricks.
(And you are truly ˹a man˺ of outstanding character.) Al-Qalam 68:4
(It is out of Allah’s mercy that you ˹O Prophet˺ have been lenient with them. Had you been cruel or hard-hearted, they would have certainly abandoned you.) Al-Imran 3: 158
Aisha (May Allah be pleased with her) was asked about the character of the Prophet (peace be upon him) and she said: “His character was the Quran”. Meaning that you find whatever matter that the Quran encouraged or commanded to be done, in his character, his behavior and his deeds.
قبل البعثة كان يسمى بالأمين لأنه ما عرف عليه من كذب أو خداع.
﴿ وَإِنَّكَ لَعَلى خُلُقٍ عَظِيمٍ ﴾
4:68 القلم
(فَبِمَا رَحْمَةٍ مِّنَ اللَّهِ لِنتَ لَهُمْ ۖ وَلَوْ كُنتَ فَظًّا غَلِيظَ الْقَلْبِ لَانفَضُّوا مِنْ حَوْلِكَ )
ال عمران 3: 158
سئلت عائشة رضي الله عنها عن خلقه صلى الله عليه و سلم فقالت : “كان خلقه القرآن”. أي أنك لا تجد أمرا أحث عليه القرآن أو أمر به إلا وجدته في خلقه و سلوكه و عمله صلى الله عليه و سلم.