A tzaddik keeps his word

This week, I read an interesting story in Hamodia about a Rabbi who was careful to keep his word.
The article by Rabbi Shimon Finkelman began with the following.
"Motza sefasecha tishmor ve'asisa - You shall observe and carry out what emerges from your lips." (Devarim 23:24).
While this verse refers to a statement that has the status of a neder (vow), its message applies to speech in general. A Jew must weigh his words and honor them."
In the 1960s, Rabbi Chaskel Besser had a son. He was close to the Bluzhever Rebbe, who was his cousin, but out of respect to his father-in-law, Rabbi Besser asked the Boyaner Rebbe to be the Sandek at the bris of his son. The Boyaner was going to be out of town on that day, so the Rebbe declined. Rabbi Besser then asked his cousin to be the Sandek and the Bluzhever Rebbe accepted the honor.
Because the baby had jaundice, the bris had to be postponed and the Bluzhever rebbe said that the Boyaner Rebbe should now be the Sandek, because he had been asked first. Both Rebbes attended the bris and both wanted to give the honor to the other. Finally, the Bluzhever Rebbe said that the Boyaner Rebbe would be the Sandek and that the Bluzhever Rebbe would be the mesader kiddushin many years later.
The years passed and Rabbi Besser's son became engaged. The Bluzhever Rebbe was 94 years old at the time, had two operations close to the time of the chupah, but assured Rabbi Besser that he would be the mesader kiddushin. And so it was.