John 10:15
As the Father knoweth me, even so know I the Father: and I lay down my life for the sheep.
There is no mention of "not one drop of Christ's blood being spilled in vain."
Honestly, bumper sticker slogans like "And, not a drop of Christ's blood is spilled in vain." really should have bumper sticker verses to back them up.
Like this one:
And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world. (1 John 2:2 KJV)