שְׁמֹ֣ר מִצְוֺתַ֣י וֶחְיֵ֑ה וְ֝תוֹרָתִ֗י כְּאִישׁ֥וֹן עֵינֶֽיךָ׃
Peliharalah perintah-perintahku, maka engkau akan hidup; jagalah ajaranku seperti biji matamu.
Rashi
like the apple of your eyes The pupil of the eye, which is like darkness, like the darkness of night.