What confused him was the report in the hadith, "May he succeed and his father, if he is truthful," in light of the report that swearing by other than Allah is shirk (associating partners with Allah)?
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Question:
He says (may Allah preserve you) that he is confused by the report, "May he succeed and his father, if he is truthful"?
Answer:
This was in the early period, and then this was abrogated, my brother. This was abrogated. This was in the early period; they used to swear by their fathers. Then it was abrogated by explicit hadiths prohibiting it: "Do not swear by your fathers. Whoever swears, let him swear by Allah."
He says (may Allah preserve you) that he is confused by the report, "May he succeed and his father, if he is truthful"?
Answer:
This was in the early period, and then this was abrogated, my brother. This was abrogated. This was in the early period; they used to swear by their fathers. Then it was abrogated by explicit hadiths prohibiting it: "Do not swear by your fathers. Whoever swears, let him swear by Allah."
Source
قناة «العلامة الدكتور صالح الفوزان»، [192 -939] أشكل عليه ما ورد في الحديث "أفلح وأبيه إن صدق" مع ما ورد أن الحلف بغير الله شرك؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.