What is the meaning of "Zanachta"?
Rashi: You were meticulous about his sons, to consider their sin, to the point that You abandoned and despised them in the days of Tzidkiyah.
Radak #1: Many are astounded 1 how the author could say so about Hashem, like one who tells his friend 'you swore, and did not fulfill!' Ibn Ezra says that a great Chacham in Sefard would not recite this Mizmor, and could not hear it. Ibn Ezra explained that it discusses the enemy's words; they revile and disgrace Hashem's words, and call them false. It says below "Zechor
Radak: Why are they astounded? The Mizmorim were said with Ru'ach ha'Kodesh. There cannot be anything wrong in them. The author is astounded at the length of the Galus, but he did not say that Hashem transgressed His Shevu'ah! Malchus [Beis] David ceased on Galus Bavel, but the Shevu'ah is not Batel. Since David's seed endured, and the kingship will return after 70 years, the Shevu'ah is intact. He is astounded at this Galus, which extended so long. You swore - how can it be that it seems that the kingship ceased? Yisrael are in Galus many years, and almost despaired from redemption.
Why does it say "[His'abarta] Im Meshichecha"?
Radak: Where is Your Shevu'ah with Your Mashi'ach? You commanded to anoint him. It seems that You reversed love to anger - You ceased kingship from his seed for many years!
Malbim: You were angry with Your Mashi'ach, and said that he abandoned the Bris.
