י֗וֹם אֲשֶׁ֨ר עָמַ֜דְתָּ לִפְנֵ֨י יְהוָ֣ה אֱלֹהֶיךָ֮ בְּחֹרֵב֒ בֶּאֱמֹ֨ר יְהוָ֜ה אֵלַ֗י הַקְהֶל־לִי֙ אֶת־הָעָ֔ם וְאַשְׁמִעֵ֖ם אֶת־דְּבָרָ֑י אֲשֶׁ֨ר יִלְמְד֜וּן לְיִרְאָ֣ה אֹתִ֗י כָּל־הַיָּמִים֙ אֲשֶׁ֨ר הֵ֤ם חַיִּים֙ עַל־הָ֣אֲדָמָ֔ה וְאֶת־בְּנֵיהֶ֖ם יְלַמֵּדֽוּן׃
N’oublie pas ce jour où tu parus en présence de l’Éternel, ton Dieu, au Horeb, lorsque l’Éternel m’eut dit: "Convoque ce peuple de ma part, je veux leur faire entendre mes paroles, afin qu’ils apprennent à me révérer tant qu’ils vivront sur la terre, et qu’ils l’enseignent à leurs enfants."
Shemirat HaLashon
And, in truth, the expenditures for the Torah study of his sons are outside of the expenditures for sustenance fixed for him on Rosh Hashanah, as Chazal have said (Beitzah 16a): "All the sustenance for man is fixed for him from Rosh Hashanah until Yom Kippur, except expenditures for Shabbath, …and expenditures for his sons' Torah studies, which, if he gives less, he is given less [by Heaven], and if he gives more, he is given more." Come and see what Chazal have said (Kiddushin 30a): "If one teaches his son's son Torah, Scripture reckons it unto him as if he had received it on Mount Sinai, viz. Devarim 4:9: 'And you shall impart them [(words of Torah)] to your sons and to the sons of your sons," followed by (Ibid. 10): 'the day you stood before the L-rd your G-d in Chorev.'" Also, through this, he merits long life for him and his sons, it being written (Ibid. 11:19): "And you shall teach them to your sons," followed by (Ibid. 21): "So that your days be prolonged and the days of your sons, etc."