Is it true that we always reap what we sow?

Is the law of sowing and reaping, or is you reap what you sow biblical? Is it true that we always reap what we sow? Similarly, if you sow to the Spirit, or only sow in faith, will we always reap blessings in return? What does the bible say about sowing and reading?
SOURCE: Got Questions Ministries - https://www.youtube.com/@gotquestions