וַיִּקְרָ֣א מֹשֶׁה֮ אֶל־כָּל־יִשְׂרָאֵל֒ וַיֹּ֣אמֶר אֲלֵהֶ֗ם שְׁמַ֤ע יִשְׂרָאֵל֙ אֶת־הַחֻקִּ֣ים וְאֶת־הַמִּשְׁפָּטִ֔ים אֲשֶׁ֧ר אָנֹכִ֛י דֹּבֵ֥ר בְּאָזְנֵיכֶ֖ם הַיּ֑וֹם וּלְמַדְתֶּ֣ם אֹתָ֔ם וּשְׁמַרְתֶּ֖ם לַעֲשֹׂתָֽם׃
Shemirat HaLashon
It is known that Torah study in itself (aside from learning leading to doing) is a positive commandment of the Torah, as it is written (Devarim 5:1): "And you shall study them (the mitzvoth) and you shall take care to do them."
Shenei Luchot HaBerit
Know - that the pious one (R. Yosef Karo) and I agreed to make a great effort on the night of Shavuot, and to keep sleep from our eyes. Praise to God, so it was. We didn't stop one moment - listen, and your soul will be revived...