Chapter 3 of God to Us deals with the covenant of redemption, or the counsel of peace. Myers defines the counsel of peace as the covenant in which the Father elects individuals and gives them to the Son to redeem. The Son covenants with the Father to redeem them. The Spirit covenants to apply redemption and to preserve the redeemed.
Myers notes that this covenant is a great mystery since the one God in three persons has one will which consents to each Person carrying out redemption distinctively.
Myers finds scripture support for the covenant of redemption in four types of passages.
First there are passages in which Christ obeys the Father to secure redemption for the elect so that they become his people (Isa 53:10-12; Jn 10:18; 12:49; 14:31; 15:10; 17:11-12, 15-16, 17, 19, 25-26; Phil 2:5-11; Heb 5:8). This is accomplished by the application of redemption by the Spirit (Jn 16:7-11; Acts 2:33; Eph 1:12-14; Titus 3:4-7).
Second, several passages indicate that the “obedience-for-reward relationship” is a covenantal relationship (Lk 22:28-30; Rom 5:18; 1 Cor 15:22).
Third, there are passages that indicate that the contents of this covenant are eternal (Eph 1:4; 3:8-12; Phil 2:5-11; Rev 13:8).
Fourth, there are passages that indicate an organic connection between this covenant and its historical out working (Isa 53:10-12; Jn 17).
Myers concludes the chapter with devotional reflections on how the covenant of redemption helps is adore the triune God.
I think that Scripture passages under points one, three, and four significantly contribute to the argument for a covenant of redemption (though I might differ with the inclusion of this or that passage). For point 2, I think Luke 22:28-30 contributes to the argument, but Romans 5:18 and 1 Corinthians 15:22 refer to temporal covenants rather than to the covenant of redemption. The main question then is whether the language of “covenant” is the best language to capture what these passages describe. My personal assessment is that once we recognize the analogical nature of covenant language as applied to the persons of the Trinity, speaking of a covenant of redemption is appropriate.