Commentaire sur Rois 2 17:6

In the ninth year. Of Hoshei'a's revolt.

And exiled Yisroel. [ויגל is the same as] ויגלה [=and he exiled] Yisroel. This is the rule for every word whose verb root [ends] with a `ה', e.g., פנה[=to face], בנה [=to build], גלה [=to go into exile], זנה [=to commit adultery], רבה [=to multiply]; when one comes to add a prefix to the word with `ו ' or a `י', if the word applies to the doer, the `י' will be voweled with a “chirik,” e.g., “And he built [=ויבן] an altar there;”¹²Bereishis 12:7. ”And Moshe turned [=ויפן] and descended;”¹³Shemos 32:15. ”And Yisroel was exiled [=ויגל] off its land;”¹⁴Below 25:21. ”And she too went and committed whoredom[=ותזן];”¹⁵Yirmiyahu 3:8. ”And the people increased [=וירב] and became very strong.”¹⁶Shemos 1:20. If however, one is talking in the causative conjugation, the `י' will be voweled with a “segol,” e.g., “And turned [=ויפן] tail to tail;”¹⁷Shoftim 15:4. ”And exiled [=ויגל] the Israelites to Ashur;”¹⁸Below, 18:11. ”And he caused the dwellers of Yerusholayim to go astray [=ויזן];”¹⁹II Divrei Hayomim 21:11. ”And He increased [=וירב] among the people of Yehudah grief and lamentation.”²⁰Eichah 2:5.