Spoken when Umar ibn al-Khattab consulted Imam about taking part in the battle of Persia.
In this matter, victory of defeat is not dependent on the smallness or greatness of forces. It is Allah's religion which He has raised above all faiths, and His army which He has mobilised and extended, till it has reached the point where it stands now, and has arrived its present positions. We hold a promise from Allah, and He will fulfil His promise and support His army.
The position of the head of government is that of the thread for beads, as it connects them and keeps them together. If the thread is broken, they will disperse and be lost, and will never come together again. The Arabs today, even though small in number are big because of Islam and strong because of unity. You should remain like the axis for them, and rotate the mill with the Arabs, and be their root. Avoid battle, because if you leave this place the Arabs will attack you from all sides and directions till the unguarded places left behind by you will become more important than those before you.
If the Persians see you tomorrow they will say, "He is the root (chief) of Arabia. If we do away with him we will be in peace." In this way this will heighten their eagerness against you and their keenness to aim at you. You say that they have set out to fight against the Muslims. Well, Allah detests their setting out more than you do, and He is more capable of preventing what He detests. As regards your idea about their (large) number, in the past we did not fight on the strength of large numbers but we fought on the basis of Allah's support and assistance.