Kohelet Rabbah 7.18

טוֹב אֲשֶׁר תֶּאֱחֹז בָּזֶה, זֶה מִקְרָא. וְגַם מִזֶּה אַל תַּנַּח אֶת יָדֶךָ, זֶה מִשְׁנָה. כִּי יְרֵא אֱלֹהִים יֵצֵא אֶת כֻּלָּם, כְּגוֹן רַבִּי אַבָּהוּ דְּקֵיסָרִין.

“It is good that you grasp this, and from that, too, do not withdraw your hand, for one who fears God will fulfill them all” (Ecclesiastes 7:18). “It is good that you grasp this,” this is Bible, “and from that, too, do not withdraw your hand,” this is Mishna; “for one who fears God will fulfill them all,” like Rabbi Abbahu of Caesarea.