Midrasch zu Jechezkiel 36:27

(6) EXCERPT......(B-Midbar 15;40) "So that you will remember and do all my mitzvot." This is comparable to one who was thrown into the sea. The captain extended a rope to him and said: 'Catch this rope in your hand and don't let it go, for if you let it go, you will have no life.' Even so, the Holy One (blessed be He) said to Israel: The whole time that you cleave to the mitzvot - (Dvarim 4:4) "And you who cleave to Ha-shem your God, you are all living today."  And similarly it says (Mishlei 4:13): "Hold tight to tradition/musar, don't let it alone, keep it safe, for it is your life."...