Shemirat HaLashon שמירת הלשון

We must walk upon the road that our forefathers trod, as it is written (Jeremiah 31:20): "Place your heart upon the road that you [i.e., your forefathers] trod. As stated by Tanna d’bei Eliyahu Rabbah 23: "When Israel were in Egypt and in the desert, they were wholehearted, etc. And when they were in Egypt, they all gathered and dwelt together, because they were all together in one bond, and they made a covenant together that they would do lovingkindness with each other, and keep in their hearts the covenant of Abraham, Isaac, and Jacob and serve their Father in Heaven alone and not forsake the language of the house of Jacob, their father, and not learn the language of Egypt so as [not to follow] the ways of the idolators. How [did this manifest itself]? When Israel served their Father alone in Egypt, and did not change their language, the Egyptians said to them: 'Why do you not serve the gods of Egypt, so that his [Pharaoh's] labor be lightened for you?' Israel answered: 'Now did our fathers, Abraham, Isaac, and Jacob forsake our Father in heaven that their children after them should forsake Him?' They answered: 'No, etc.' And they circumcised their sons in Egypt and the Egyptians said to them: 'If you do not keep [this practice] and do not circumcise, perhaps the hard labor will be lightened for you,.' And Israel said: 'Did our fathers forget the covenant of our G-d in heaven that their children after them should forget it?' The Egyptians: 'No.' And Israel: 'Just as our fathers, so we shall not forget forever.' A variant: When Israel circumcised their sons in Egypt, the Egyptians asked them: 'Why do you circumcise your sons? After a short time won't they be thrown into the river?' Israel: 'We will circumcise them, and afterwards, do with them as you like.' And when Israel would make the seven-day [wedding] feast, the Egyptians asked: 'Why… After a short time won't he be taken out to back-breaking labor?' Israel: 'We will make the… feast, and afterwards, do with us as you like. The dead will die and the killed will be killed and the born will live.' With all of this, the Egyptians would revile Israel, and smite them, and beat them, and intimidate them, and Israel could not flee from them, as it is written (Psalms 42:14): "You make us a shame to our neighbors, a mockery and a scorn to those around us… (18): All this has befallen us, but we have not forgotten You, and we have not belied Your covenant, etc."'"

If so, we, too, will set our hearts to that road, and we shall see to it to do lovingkindness with one another and keep the covenant of Abraham, Isaac, and Jacob to serve our G-d in heaven alone and not incline our hearts to the enticement of the yetzer hara and its claims, just as Israel did not incline their ears to the claims of the Egyptians even though they offered to lighten their burdens. And for this let there be fulfilled in us the verse (Michah 7:15): "As the day of your [i.e., your fathers'] going out of the land of Egypt, I will show it [Israel] wonders," speedily, in our days, Amen!