Towards the end of the book of Jeremiah, he purchased a field from his cousin. I didn’t really understand that part. Would you please explain it to me?
You’re speaking of Jeremiah 32. The Lord’s purpose in having Jeremiah buy the field was to demonstrate to the Israelites that the Babylonian captivity was not permanent. Having the purchase documents preserved would allow Jeremiah’s heirs to establish their claim to the land once the captivity was over.
Jeremiah had earlier prophesied that the captivity would last for 70 years (Jeremiah 25:11) and the purchase provided “real world” confirmation that after the 70 years were over, the Jews would come back and reestablish the nation. Otherwise recording the purchase and preserving the documents would have made no sense.