Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) sought help from the Jews of Banu Qaynuqa' and gave them some property as a gift in return, but did not give them a fixed share.
Only al-Hasan bin Umarah narrated this, and he is matruk (abandoned). No authentic hadith on this has reached us, and we have narrated before this (reports) on the dislike of seeking help from the polytheists.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17970