4:71An-Nisaa

Once the Messenger of Allah (ﷺ) intended to go on an expedition. He said: O group of the emigrants (Muhajirun) and the helpers (Ansar), among your brethren there are people who have neither property nor family. So one of you should take with him two or three persons; with me. I also rode on my camel by turns like one of them.

“The Messenger of Allah (ﷺ) said concerning the fear prayer: “The Imam should lead one group in prayer, and they should perform one prostration, and there should be another group between them and the enemy (guarding them). Then those who did the prostration with their leader should move away, and take the place of those who have not yet prayed. Then those who have not yet prayed should come forward and perform one prostration with their leader. Then their leader should move away, and his prayer will be complete. Then each group should perform one prostration by itself. If the fear is too great, then (they should pray) on foot or riding.’” He said: What is meant by prostration here is a Rak’ah.

Proceed on, it is Jumdan, Mufarradun have gone ahead. They (the Companions of the Holy Prophet) said: Allah's Messenger, who are Mufarradun? He said: They are those males and females who remember Allah much.

We were commanded to go out as well as the hidden away ladies and those unmarried. She said menstruating women were to come out amongst you, but remain behind people and pronounce takbir (Allah-o-Akbar) along with them.

AbuAyyub heard the Messenger of Allah (ﷺ) say: Capitals will be conquered at your hands, and you will have to raise companies in large armies. A man will be unwilling to join a company, so he will escape from his people and go round the tribes offering himself to them, saying: Whose place may I take in such and such expedition? Whose place may I take in such and such expedition? Beware: That man is a hireling to the last drop of his blood.