What is this "covenant with death", and this "agreement with hell", and who is this "precious corner stone"?

Beloved (this is a good word ;-), this "covenant" is what "you have said" (you here as we, or the human mind ;-) and given what we say a part from Christ is nothing, and therefore, this covenant can only be illusion or deception of the self by the self, as Christ Jesus has overcome death. The following came to heart: "But be ye doers of the word, and not hearers only, deceiving your own selves." (James 1:22) perhaps because "doers of the word" and, we all know who "the word" is: "And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth." (John 1:14) make a covenant (or become one) with life and forsake death. Hope that makes sense ;-) Anyhow another amazing question!!! Much love and grace to you my beloved brother, so look forward to our fellowship in the kingdom ;-) Love - D