Hadith #3258 (Sunan Abi Dawud)
Book: Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)
Narrator(s): Muhammad bin 'Isa bin Hyan محمد بن عيسى بن حيان, Muhammad bin Yahya bin Hiban محمد بن يحيى بن حبان, Yahya bin al-'Ala al-Bijly يحيى بن العلاء البجلي, Yusuf bin 'Abdullah bin Salam
Grade: Sahih

The Prophet (ﷺ) said: If anyone takes an oath and says: I am free from Islam; now if he is a liar (in his oath), he will not return to Islam with soundness.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3258/

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Hadith #2709 (Sunan Ibn Majah)
Book: Chapters on Hajj Rituals
Narrator(s): Abdur-Razzaq عبد الرزاق بن همام, Bashr bin Nmyr al-Qshyry بشر بن نمير القشيري, Makhul al-Shami/al-Damashiqi مكحول الشامي, Safwan bin Umayyah, Yahya bin al-'Ala al-Bijly يحيى بن العلاء البجلي, Yazid bin 'Abdullah bin al-Shakhayr يزيد بن عبد الله بن الشخير

“Whoever enters Ihram for Hajj and ‘Umrah, one Tawaf is sufficient for both, and he should not exit Ihram until he has completed his Hajj, when he should exit Ihram for both.”

Source: https://parallelquran.com/hadith/sunan-ibn-majah-2709/