Dewarim 4:1 Kommentar: Chizkuni, Ibn Ezra, Sforno & Or HaChaim

ועתה ישראל וגו, “and now, Israel, etc;” according to the beginning of the Sifri at the beginning of this paragraph, the words: ועתה ישראל, “and now, Israel, etc.;” are Moses’ introduction to relating laws in the Torah, after he had reminded the people why it had taken so long since the Exodus until now and the reason why they were still on the east bank of the river Jordan. He had reviewed how in spite of all the disappointments that their conduct had caused G-d, He had not stopped displaying His fondness for them in a tangible manner each day. He, Moses, would have long ago been able to enter the Holy Land had it not been for the delays caused by them, and his having exhausted the lifespan accorded to him during those years. [His having struck the rock by mistake would have been a scenario that could never have occurred but for their having been condemned to be in the desert for so many years. Ed.] It certainly was time for them now to listen to all the laws that it would be their duty to observe once they crossed the river Jordan

teach you to do The ultimate purpose of study is the performance of the commandments.

ועתה ישראל, after you have seen the decree of G’d to exile you if you sin, be on guard to meticulously observe His commandments without adding to them or detracting from them. An addition or a detraction will both have destructive consequences for you.