(Ibid.) "that G–d did not lead them ('nacham')." This "nichum" connotes leading, as in (Psalms 77:21) "You have led (nachitha) Your people like sheep," and (Ibid. 78:4) "And He led them (vayanchem) with a cloud by day, and all the night with a light of fire."
That God Did Not Lead Them Nacham
Mekhilta Tractate Vayehi Beshalach 1:2