מדרש על שמואל ב 16:12

The verses My soul hath them still in remembrance and is bowed down within me (Lam. 3:20) and It may be that the Lord will look on mine eyes (II Sam. 16:12) were amended by the men of the Great Synagogue. They are called scribes because they counted every letter in the Torah and interpreted it.¹²Sofer (“scribe”) is derived from safar (“to count”). Thus they amended And lo, they put the branch unto My nose (Exod. 8:17) to read their nose. Likewise, they altered the verse we are discussing Surely he that toucheth you toucheth the apple of My eye (ibid.) to read His eye. This was to teach us that everyone who rises up against Israel is considered as rising up against the Shekhinah. Hence it says: Curse ye bitterly the inhabitants thereof, because they came not to the help of the Lord (Judg. 5:23).