Chasidut zu Bereschit 1:9

Moses’ song was inspired by the immensity of the ‎miracle that he and the people had witnessed at the ‎time. They had witnessed the “death” and ‎‎“resurrection” of the universe, albeit in miniature. If ‎the letter ‎ז‎ is symbolic of the ‎עולם העשיה‎, the universe ‎after its completion on the seventh day, the letter ‎א‎ is ‎symbolic of the very beginning of creation, so that ‎Moses alluded to the process of a reversal in the ‎creative process as having occurred as part of the ‎miracle they had witnessed at that time. It is not ‎accidental that in the Torah scroll instead of writing ‎the ‎שירה‎, “song” in the normal fashion, the lines are ‎broken, interrupted so as to convey the manner in ‎which bricks are laid, not one exactly above the other, ‎but in a pattern that enables the wall to survive sudden ‎impacts. This is true even of stone walls that are not ‎joined by cement.‎
At this point the author allegorically describes ‎חיות‎, ‎the essence of “life” as the word of G’d which was the ‎cement that holds together the different parts of the ‎universe, all of which came into existence by His ten ‎oral directives enumerated in the first chapter of ‎Genesis. The empty spaces between the letters (words) ‎are an allusion to the part of the world where this ‎miracle occurred having retreated toward its origin ‎before the definite contours of that universe had been ‎finalized. ‎‎