וְאַתָּ֣ה אָמַ֔רְתָּ הֵיטֵ֥ב אֵיטִ֖יב עִמָּ֑ךְ וְשַׂמְתִּ֤י אֶֽת־זַרְעֲךָ֙ כְּח֣וֹל הַיָּ֔ם אֲשֶׁ֥ר לֹא־יִסָּפֵ֖ר מֵרֹֽב׃
주께서 말씀하시기를 내가 정녕 네게 은혜를 베풀어 네 씨로 바다의 셀 수 없는 모래와 같이 많게 하리라 하셨나이다
Rabbeinu Chananel
כי ירא אנכי, these words correspond to the word וחטאה in the list of attributes in Exodus. It is a minor type of sin, the one committed inadvertently.
Rabbeinu Chananel
ואתה אמרת, these words and their continuation correspond to the word ונקה in the list of G’d’s attributes revealed to Moses in Exodus 34,7.
Rashi
היטב איטיב I WILL SURELY DO [THEE] GOOD — The use of two words denoting “doing good” is intended to signify: היטב doing good to thee on account of your own merits, איטיב I will also do good to thee on account of your father’s merits (Genesis Rabbah 76:7).