Just so you know: John Wesley saw the Law of Moses as having three parts: ceremonial (for Israel's temporary use), civil (for Israel's society), and moral (the Ten Commandments and core ethics), which remains eternally binding for all people. He taught that believers are freed from the ceremonial law but remain under the moral law, which points to our sin, convicts us, and drives us to Christ for grace to live holy lives, establishing a harmony between Law and Gospel, not opposition. This is the Holiness tradition found in more then just the Methodist Church.
Holiness isn’t a side note in Pentecostalism—it’s one of its
foundations. Historically, the Pentecostal movement
grew out of the Holiness movement, and the theology of holiness shapes Pentecostal identity, ethics, worship, and spiritual experience. So I can not accept your belief that Pentecostals reject the Holiness of God.
Holiness is intrinsically linked to the
Law of Moses, as the Law is God's expression of His own holy nature, setting a standard for His people to be "holy as I am holy" (Leviticus 19:2). The Law provided detailed moral, ceremonial, and judicial guidelines to teach Israel about God's purity, reveal their sinfulness, and point towards the need for atonement, ultimately finding its fulfillment in Jesus Christ, who embodies that perfect holiness.