It is not permissible to swear by other than Allah, whoever it may be
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Question: What is the ruling on one who swears by the Prophet?
Answer: It is not permissible to swear by other than Allah, whoever it may be—neither by the Prophet nor by anyone else. The Prophet (peace and blessings be upon him) said:Sahih al-Bukhari 2679, and he said: Mishkat al-Masabih 3418, and he (peace and blessings be upon him) said: Musnad Ahmad 329Sahih (Darussalam), narrated by Imam Ahmad with a sound chain from 'Umar (may Allah be pleased with him). Abu Dawud and al-Tirmidhi also narrated it with a sound chain from Ibn 'Umar (may Allah be pleased with them both) from the Prophet (peace and blessings be upon him) that he said: Riyad as-Salihin 1711, and he (peace and blessings be upon him) said: Sunan Abi Dawud 3253Sahih (Al-Albani).
The point is that it is obligatory to swear by Allah alone, and it is not permissible to swear by the Prophet, nor by anyone other than the Prophet, nor by trust, nor by the Ka'bah, nor by anything else. One swears by Allah alone. He (peace and blessings be upon him) said:Sahih al-Bukhari 2679, and it is not permissible to swear by other than Allah, whoever it may be. We ask Allah for well-being.
Answer: It is not permissible to swear by other than Allah, whoever it may be—neither by the Prophet nor by anyone else. The Prophet (peace and blessings be upon him) said:
Whoever has to take an oath should swear by Allah or remain silent.
من كان حالفًا فليحلف بالله أو ليصمتDo not swear by your fathers, or by your mothers, or by rivals (Cf. Al-Qur’an 2:22 etc. The reference is to idols or false gods) to God; and swear by God only when you are speaking the truth.
لا تحلفوا بآبائكم ولا بأمهاتكم، ولا بالأنداد، ولا تحلفوا بالله إلا وأنتم صادقونwhoever swears by anything other than Allah has committed an act of shirk.
من حلف بشيء دون الله فقد أشركHe who swears by anyone or anything other than Allah, has indeed committed an act of Kufr or Shirk
من حلف بغير الله فقد كفر أو أشركHe who swears by Amanah (faithfulness) is not one of us.
من حلف بالأمانة فليس مناThe point is that it is obligatory to swear by Allah alone, and it is not permissible to swear by the Prophet, nor by anyone other than the Prophet, nor by trust, nor by the Ka'bah, nor by anything else. One swears by Allah alone. He (peace and blessings be upon him) said:
Whoever has to take an oath should swear by Allah or remain silent.
من كان حالفًا فليحلف بالله أو ليصمت
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.