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.

حَدَّثَنَا الْحَسَنُ بْنُ الصَّبَّاحِ، حَدَّثَنَا إِسْمَاعِيلُ، - يَعْنِي ابْنَ عَبْدِ الْكَرِيمِ - حَدَّثَنِي إِبْرَاهِيمُ، - يَعْنِي ابْنَ عَقِيلِ بْنِ مُنَبِّهٍ - عَنْ أَبِيهِ، عَنْ وَهْبٍ، قَالَ سَأَلْتُ جَابِرًا عَنْ شَأْنِ، ثَقِيفٍ إِذْ بَايَعَتْ قَالَ اشْتَرَطَتْ عَلَى النَّبِيِّ ﷺ أَنْ لاَ صَدَقَةَ عَلَيْهَا وَلاَ جِهَادَ وَأَنَّهُ سَمِعَ النَّبِيَّ ﷺ بَعْدَ ذَلِكَ يَقُولُ " سَيَتَصَدَّقُونَ وَيُجَاهِدُونَ إِذَا أَسْلَمُوا " .