Please answer the question with some scriptural support!!!
It’s not just a saying. It is Catholic doctrine.
1 Peter 2:9
But you are a chosen race, a royal priesthood, a holy nation, God’s own people, that you may declare the wonderful deeds of him who called you out of darkness into his marvelous light.
1 Peter 2:4-5
Come to him, to that living stone, rejected by men but in God’s sight chosen and precious; and like living stones be yourselves built into a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ.
We Catholics recognize only one Priest - Jesus Christ. But all of His members (the baptised faithful) participate in His priesthood. There are two different roles that Jesus shares with His members - The ordained priesthood, of which most people are aware, and the common priesthood of the baptised.
Every baptised Christian (male or female, Catholic or non-Catholic) is to be a priest to his or her own family and within their sphere of influence. You should bless and pray for your home, your children, your workplace and your community.
Did you know that the ordinary ministers of the sacrament of marriage are the bride and groom themselves, by virtue of their priesthood? The ordained priest does not perform the sacrament (the bride and groom do that) - the ordained priest is the Church’s witness to the sacrament.
When we participate in the mass, we are doing so as priests of Christ, sharing in His one priesthood. He is the vine, and we are the branches (John 15:5). We share His priesthood as the branches share the sap of the vine.
The ordained priesthood, by contrast, is authorized to represent Jesus’ priesthood to the Church and to the world at large.
Hope this helps,
We Catholics recognize only one Priest - Jesus Christ