
This passage is what I consider to be the most powerful message of Shavuot.
We know that Jesus celebrated each of the feasts of God in Leviticus 23, since He was under the Law. The gospels tell us what He was doing during and teaching one of those years, at the time of the feast of Shavuot.
On that occasion, He taught and trained the disciples about of the work of the ekklesia (church) that was to be born. It is extraordinary that He gave the teaching in what was considered then to be a foreign territory to the Jewish people. Surely, this was to prepare the disciples for the worldwide work of the new institution to come.
The teaching is found in the fourth chapter of John when Yeshua was in Samaria. What was Jesus doing in Samaria at Shavuot? He was leaving Judea to go to Galilee, but Jews would not usually go through Samaria. Religious Jews would take the longer route through Perea to the east because they despised the Samaritans, who also despised the Jews. These groups were always at odds with each other.