Oneness

I and my Father are one. John 10:30

“one Lord, one faith, one baptism;”
Ephesians‬ ‭4:5‬

“There is one body and one Spirit, just as you were called to one hope when you were called;”
‭‭Ephesians‬ ‭4:4‬ ‭

‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh.’ So they are no longer two, but one flesh.
‭‭Mark‬ ‭10:7-8

“Haven’t you read,” he replied, “that at the beginning the Creator ‘made them male and female,’ and said, ‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh’”
‭‭Matthew‬ ‭19:4-5

Oneness begins with God our Father, Jesus his son and The Holy Spirit-oneness in three persons.  That oneness is to be exampled in the relationship between husband and wife: one flesh-two working as one.