His other question asks: Is it permissible to swear by other than Allah (Glorified and Exalted is He)? For I see some people swearing by the Ka'bah, by the Qur'an, and by Muhammad, and when I discuss this with them...

The questioner : His other question asks: Is it permissible to swear by other than Allah (Glorified and Exalted is He)? For I see people swearing by the Ka'bah; I see some people swearing by the Ka'bah, by the Qur'an, and by Muhammad, and when I discuss this with them, they say that Allah (Glorified and Exalted is He) said: or they say that He said: What is the ruling on this?

The Shaykh : Swearing by other than Allah or by one of His attributes is forbidden, and it is a type of shirk (associating partners with Allah). For this reason, the Prophet (peace and blessings be upon him) said: It was also reported from him (peace and blessings be upon him) that he said: And it is established from him that he said: This indicates that swearing by other than Allah is shirk that is purified by the word of sincerity: La ilaha illa Allah (There is no deity but Allah).
Accordingly, it is forbidden for a Muslim to swear by other than Allah (Glorified and Exalted is He), neither by the Ka'bah, nor by the Prophet (peace and blessings be upon him), nor by Jibril, nor by Mikail, nor by a wali (close friend of Allah) among the awliya (close friends of Allah), nor by a caliph among the caliphs of the Muslims, nor by honor, nor by nationality, nor by patriotism. Every oath by other than Allah is forbidden, and it is a type of shirk and kufr (disbelief), may Allah protect us from it. As for swearing by the Qur'an, which is the speech of Allah, there is nothing wrong with it, because the Qur'an is the speech of Allah (Glorified and Exalted is He); Allah spoke with it in reality, with His own wording, intending its meaning. And He (Glorified and Exalted is He) is described as having speech. Therefore, swearing by the Qur'an is swearing by one of the attributes of Allah (Glorified and Exalted is He), and it is permissible.
As for the counter-argument of those you advise against this, citing the saying of the Exalted: and the like, this is from the deeds of the people of deviation who follow what is ambiguous in the revelation of Allah (Glorified and Exalted is He) and use it to oppose the clear verses. This oath is one by which our Lord (Glorified and Exalted is He) swore, and it is permissible for Allah the Exalted to swear by whatever He wills of His creations that indicate His greatness and power. And He (Glorified and Exalted is He) has forbidden us, through the tongue of His Messenger (peace and blessings be upon him), to swear by other than Him. So it is upon us to obey the command, and it is not upon us to oppose the command of Allah with what Allah spoke. Indeed, Allah does what He wills. Yes.