The one baptism of Ephesians 4:5 is not the baptism “to fulfill all righteousness” by which Jesus was baptized: “Then Jesus came from Galilee to John at the Jordan to be baptized by him. And John tried to prevent Him, saying, “I need to be baptized by You, and are You coming to me?” But Jesus answered and said to him, “Permit it to be so now, for thus it is fitting for us to fulfill all righteousness.” Then he allowed Him.” (Matthew 3:13-15)
If Jesus had been a sinner like everyone else whom John had baptized, he would not have hesitated to baptize Him. But John knew that Jesus had no sins to be remitted. Therefore, he tried to forbid Jesus from being baptized. Jesus informed John that His desire to be baptized was not for remission of sins, but rather, to “fulfill all righteousness” (v. 15). According to Psalms 119:172, all of God’s commandments are righteousness. Therefore, to say that Jesus wanted to be baptized “to fulfill all righteousness” is to say that Jesus desired to obey each and every requirement of the Father. To reject the “baptism which John preached” (Acts 10:37) was tantamount to rejecting the counsel of God (Luke 7:29-30). Accordingly, if Jesus had refused (or neglected) to be baptized, someone could have (and no doubt would have) accused Him of rejecting the counsel of God.
Therefore, Jesus’ baptism “to fulfill all righteousness” is not the “one baptism” of Ephesians 4:5 which is in force today.