The ruling on a man following another who was praying alone

Question:
He says: Often I am praying one of the obligatory prayers, praying alone, and another person comes to my side intending to pray in congregation. When another person comes, I step forward and they follow me in my prayer, even though I originally intended to pray this obligatory prayer alone. What is the ruling on my prayer, and what is the ruling on the prayer of the followers who followed me? Please inform us, may Allah bless you.

Answer:
It is obligatory for the believer to hasten so that he attends the congregation and participates in the congregation in the houses of Allah the Exalted, and it is not permissible for him to delay without a valid religious excuse. Rather, it is obligatory to be prompt so that he participates with his Muslim brothers and attends the congregation with the imam of the mosque. This is based on the saying of the Prophet (peace and blessings be upon him): in my house? He said to him (peace and blessings be upon him): Do you hear the call to prayer? He said: Yes. He said: Then respond to it. Muslim narrated it in his Sahih.
And because the virtue of the congregation is great, the believer should not deprive himself of this great good. This is based on the saying of the Prophet (peace and blessings be upon him): its authenticity is confirmed. However, if a person delays and misses the congregation, and prays alone, and then some people come and pray to his right, they become a congregation, and there is no harm in that. If he was alone at the time of entering the prayer and did not intend to be the imam, then when a second person comes with him, he should intend to be the imam. If a third person comes with him, he should move them back and step forward, as you did. It is established that the Messenger (peace and blessings be upon him) used to pray alone at night, so Ibn Abbas (may Allah be pleased with him) came and lined up to his left. He took him by his right hand and placed him on his right, and prayed with him (peace and blessings be upon him), although he had not intended to be the imam at first; he was praying alone. It is agreed upon that this is authentic. Similarly, this occurred in another story with Anas when he visited the house of the Prophet’s (peace and blessings be upon him) grandmother and prayed the Duha prayer with them. Anas stood to his right, so he (peace and blessings be upon him) prayed with him while he was on his right and the woman was behind him with them. It is also established about him (peace and blessings be upon him) that he used to pray alone, so Jabir and Jubayr from the Ansar came and lined up to his right and left. He moved them behind him and prayed with them. Muslim narrated it in his Sahih. This is the prescribed matter, and Allah knows best. Yes.