In the name of God the Compassionate, the Merciful.

This is a document from Muhammad the prophet (governing the relations) between the believers and Muslims of Quraysh and Yathrib, and those [Jews] who followed them and joined them and labored with them.

They are one community (ummah) to the exclusion of all men…

To the Jew who follows us belong help and equality. He shall not be wronged nor shall his enemies be aided…

The Jews shall contribute to the cost of war [with the Muslims] so long as they are fighting alongside the believers.
…
The Jews must bear their expenses and the Muslims their expenses. Each must help the other against anyone who attacks the people of this document. They must seek mutual advice and consultation, and loyalty is a protection against treachery. A man is not liable for his ally’s misdeeds. The wronged must be helped.

The Jews must pay with the believers so long as war lasts.

source: Ibn Ishaq, Sirat Rasul Allah