"The LORD is my strength and song" (Exodus 15:2). "My strength" means none other than Torah, as it is said, "The LORD will give strength to His people" (Psalms 29:11), and it says, "and the king's strength loves justice" (cf. Psalms 99:4).
My Strength Is None Other Than the Torah
Yalkut Shimoni on Torah 244:1
(שמות טו ב) עָזִּי וְזִמְרָת יָהּ. אֵין עָזִּי אֶלָּא תּוֹרָה, שֶׁנֶּאֱמַר (תהלים כט, יא) "ה' עֹז לְעַמּוֹ יִתֵּן", וְאוֹמֵר "וְעֹז מֶלֶךְ מִשְׁפָּט אָהֵב".