I read in [Majmu' al-Fatawa] that the hadith, "If a judge exercises independent legal reasoning and is correct, he has two rewards," includes matters of…!!?

Question:
He says: Honorable Shaykh, may Allah grant you success. I read in Majmu' al-Fatawa that the hadith of ijtihad, which is "If a judge exercises independent legal reasoning and is correct, he has two rewards," and so on, includes matters of 'aqidah (creed). What is the basis for this, and is it authentic from the Shaykh? It is read in Majmu' al-Fatawa that the hadith of ijtihad, meaning "If a judge exercises independent legal reasoning and is correct, he has two rewards," includes matters of 'aqidah. What is the basis for this? And is it authentic from the Shaykh?

Answer:
I do not know. We need the text, we need the text of the Shaykh's words to see it. Yes.