And you shall keep My commandments.

ואת מצותי תשמורו

Leviticus (Vayikra), Chapter 26, Verse 3. The full verse is:

אִם בְּחֻקֹּתַי תֵּלֵכוּ וְאֶת מִצְוֺתַי תִּשְׁמְרוּ וַעֲשִׂיתֶם אֹתָם

Shiurim in this topic
3728. Saying you have no news to report and that's why you aren't writing only increases the surprise.
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