The words יָשִ יר Yashir and אָ שִ ירָ ה Ashira are both in future tense, meaning: we will sing. We may suggest that this is a major message: We’re not just singing now after Kriyas Yam Suf; we must continue singing! In fact, every day during Shachris we say Az Yashir and P’sukei D’zimra. A Yid must always be in a singing and dancing mode. If he doesn’t feel way, it is an unfortunate sign that he isn’t living with Hashem, and he needs lots of Shaar HaBitachon or other Seforim that give him the truth: Everything is good, since Hashem is in charge! A Baal Bitachon is thrilled with whatever Hashem gives him in life. (Chovos Halvavos).
Be Happy and Sing Over Your Accomplishments
כִ י הָ אָ דָ ם עֵ ץ הַ שָ דֶ ה תצא כ יט Man is compared to the tree of the field. The trees have beautiful birds perched on their branches, singing beautiful songs, to remind mankind to be happy and sing over his accomplishments. When you do a Mitzva, you get 1,000 times more Schar when you do it with Simcha Shel Mitzva. (Orchos Tzaddikim). The holy Alshich says that: אָ שִׁ ירָ הֵלַ ה'ֵֵטוֵא I will sing to Hashem is in: לָ שוֹןֵיָחִׁ יד singular form, as if the entire K'riyas Yam Suf was your own Zechus, since you worked on Bitachon.
