Ruling on combining the Zuhr, 'Asr, Maghrib, and 'Isha' prayers without an excuse

Question:
We have a group in Yemen called al-Mukarimah. They constantly combine the Zuhr and 'Asr prayers, and this combination occurs between the two time periods. What is the view of Islam regarding this? And what is the belief of the Mukarimah?

Answer:
This is well known about the Mukarimah Shi'ah, the Batiniyyah Shi'ah. It is also well known about the Shi'ah in most of their types that they combine the Zuhr and 'Asr, and the Maghrib and 'Isha'. This is an error according to the people of the Sunnah and the community, and it is wrong. The Prophet (peace and blessings be upon him) established the times for the prayers and distinguished them. When he distinguished the time for Zuhr and 'Asr, and the time for Maghrib and 'Isha', he said: "The prayer is between these two times," and Jibril taught him that...
So the time is preserved, and Allah (Glorified and Exalted is He) has clarified it in the Book and the Sunnah. It is made clear in the noble Qur'an and in the pure Sunnah from the Prophet (may the prayer and peace of Allah be upon him). So Muslims must act accordingly and pray the prayer in its time: Zuhr in its time, 'Asr in its time, Maghrib in its time, 'Isha in its time, and Fajr in its time. It is not permissible for them to imitate those who have opposed the command of Allah and introduced into the religion what Allah has not authorized, from the Shi'ah and others. And whoever has contact with them should advise them and say to them: If you are Muslims, then be upright on the path of Islam and pray the prayer at its time.
And regarding the Mukarimah, it has reached us that they are upon the religion of the Batiniyyah, but they hide that. I asked some of their leaders and heads, and he refused to inform me. He said: "We are upon your religion and your way, and we have nothing that contradicts you." So he was unable to clarify to us anything of his belief.
But what is famous among the scholars of knowledge who knew them is that they are upon the religion of the Batiniyyah and upon the religion of the Rafidah in exalting the Ahl al-Bayt, calling upon them besides Allah, and worshipping them besides Allah, such as 'Ali, al-Hasan, al-Husayn, and Fatimah. They call upon them besides Allah, seek aid through them, make vows for them, and slaughter for them. This is what has reached us about the Rafidah and those similar to them from the Batiniyyah.
But some of them practice hypocrisy; if the Muslims practice hypocrisy, they do not clarify that and hide it. However, they may outwardly display some of their innovations, such as this innovation of combining the two prayers without an excuse. As for if it is for an excuse, like a traveler; there is no harm in combining. A sick person combines for an excuse; there is no harm.

Question: And they say in the adhan: "Hayya 'ala khayr al-'amal"?

Answer: That is also an innovation. Their saying in the adhan: "Hayya 'ala khayr al-'amal," and their saying in the adhan: "I bear witness that 'Ali is the wali of Allah," is an innovation. It is not in the correct adhan. This is an innovation they added. The matter is as you have heard; there is no basis for this addition. This addition is invalid and has no foundation.