2. That it is obligatory—every Muslim is required to pray with the congregation; if he neglects to do so, he incurs sin, though his prayer itself remains valid.

3. That praying in congregation is a condition for the validity of the prayer; therefore, if a person fails to join the congregation, his prayer is null and will not be accepted. This last view was adopted by Shaykh al-Islām Ibn Taymiyyah (d. 728 AH) and is one of the reported positions of Imām Aḥmad. They argue that anyone who prays alone without a legitimate excuse has his prayer rejected, just like someone who prays without ablution. Their reasoning is that congregational prayer is obligatory, and the legal maxim states that whoever omits an obligatory act within the prayer invalidates it.

The strongest opinion, however, is that it is indeed obligatory, so a person is sinful for abandoning it; yet, if he performs the prayer alone, his prayer is still accepted. Thus, congregation is not a prerequisite for validity. The proof is the ḥadith of ʿAbd Allāh ibn ʿUmar (may Allah be pleased with them both) in which the Prophet ﷺ said, “The congregational prayer is superior to a man’s solitary prayer by twenty-seven degrees.” The very act of comparison shows that the solitary prayer does carry reward; otherwise, no preference could be stated. Nevertheless, the one who deliberately avoids the congregation is blameworthy.

Likewise, the ḥadith of Abū Hurayrah states that the congregational prayer surpasses a man’s prayer in his house or marketplace by twenty-five times. There is no contradiction between the two reports; we simply go with the higher figure, for the bounty of Allah is vast. The Prophet ﷺ then explained why: when a person performs his ablution at home and perfects it, then departs for the mosque motivated solely by the prayer, he does not take a single step without being raised one degree and having one sin erased. In other words, each step brings two distinct benefits.