سنن أبي داود

Narrated Jabir ibn Abdullah:

Wahb said: I asked Jabir about the condition of Thaqif when they took the oath of allegiance. He said: They stipulated to the Prophet (ﷺ) that there would be no sadaqah (i.e. zakat) on them nor Jihad (striving in the way of Allah). He then heard the Prophet (ﷺ) say: Later on they will give sadaqah (zakat) and will strive in the way of Allah when they embrace Islam.