قَالَ: صَدَقْتَ، فَعَجِبْنَا لَهُ يَسْأَلُهُ وَيُصَدِّقُهُ، قَالَ: فَأَخْبِرْنِي عَنِ الْإِيمَانِ
Translation: He said, “You have spoken the truth.” We were amazed that he asked the Prophet ﷺ and then confirmed him. He then asked, “Tell me about Iman.”
The visitor heard the answer and said صَدَقْتَ, “You have spoken truth.” The companions were surprised because someone apparently asking for information was also confirming its correctness as though he already knew it.
فَعَجِبْنَا لَهُ means “we were amazed at him,” while يَسْأَلُهُ وَيُصَدِّقُهُ contains two present-tense verbs: “he questions him and confirms him.”
This surprise advances the account. Its resolution comes at the end, when the purpose of the questions is disclosed: teaching the whole assembly.