When God the way of life would teach,
And gather all His own,
He placed them safe beyond the reach
Of death, by blood alone.

By Christ, the sinless Lamb of God,
The precious blood was shed,
When He fulfilled God’s holy word,
And suffered in our stead.

O soul, for thee salvation thus
By God is freely given;
The blood of Christ atones for sin,
And makes us meet for heaven.

The wrath of God that was our due,
Upon the Lamb was laid;
And by the shedding of His blood,
The debt for us was paid.

How calm the judgment hour shall pass
To all who do obey
The word of God about the blood,
And make that word their stay.

Chorus
It is His word, God’s precious word,
It stands forever true:
When I, the Lord, shall see the blood,
I will pass over you.
                             El. Nathan


And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt.  Exod 12:13



Mark the form of the promise.  God does not say, "And when ye shall look upon the bow, and ye shall remember My covenant, then I will not destroy the earth;" but it is gloriously put, not upon our memory, which is fickle and frail, but upon God's memory, which is infinite and immutable.  "The bow shall be in the cloud; and I will look upon it, that I may remember the everlasting covenant."  Oh, it is not my remembering God, it is God's remembering me, which is the ground of my safety; it is not my laying hold of His covenant, but His covenant's laying hold on me.  Glory be to God!  The whole of the bulwarks of salvation are secured by divine power, and even the minor towers, which we may imagine might have been left to man, are guarded by almighty strength.  Even the remembrance of the covenant is not left to our memories, for we might forget; but our Lord cannot forget the saints whom He has graven on the palms of His hands.  It is with us as with Israel in Egypt; the blood was upon the lintel and the two side-posts, but the Lord did not say, "When you see the blood I will pass over you," but, "When I see the blood, I will pass over you."  My looking to Jesus brings me joy and peace, but it is God's looking to Jesus which secures my salvation and that of all His elect, since it is impossible for our God to look at Christ, our bleeding Surety, and then to be angry with us for sins already punished in Him.  No, it is not left with us even to be saved by remembering the covenant.  There is no linsey-woolsey here-not a single thread of the creature mars the fabric.  It is not of man, neither by man, but of the Lord alone.  We should remember the covenant, and we shall do it, through divine grace; but the hinge of our safety does not hang there-it is God's remembering us, not our remembering Him; and hence the covenant is an everlasting covenant. 
                                                                                                                                        C. H. Spurgeon