Surah Sad 38:4

وَعَجِبُوٓا۟ أَن جَآءَهُم مُّنذِرٌ مِّنْهُمْ ۖ وَقَالَ ٱلْكَـٰفِرُونَ هَـٰذَا سَـٰحِرٌ كَذَّابٌ

And they wonder that there has come to them a warner [i.e., Prophet Muḥammad (ﷺ)] from among themselves. And the disbelievers say, "This is a magician and a liar.

Translation: Saheeh International

Tafsir

And they marvel that a warner has come to them from among themselves a messenger from among their number to warn them and to threaten them with the punishment of the Fire after resurrection — and this warner is the Prophet s. …

Excerpt from Tafsir al-Jalalayn, commentary on 38:4, via Quran.com. The reader has the full commentary and 9 more tafsirs.