The king will praise the ability of the Commonwealth to come together in the spirit of friendship in these uncertain times' during his annual message.
The address of Charles will be fully published on Monday for Commonwealth Day, when the annual service in honor of the Commonwealth is attended by senior members of the royal family and a congregation of invited guests.
The king will tell the meeting in Westminster Abbey: “In these uncertain times, where it is all too easy to believe that our differences are problems instead of a source of strength and an opportunity to learn, the remarkable collection of nations and peoples of the Commonwealth come together in the spirit of support and, crucial, friendship.”
Charles will also say: “The ability of the Commonwealth to bring people from all over the world together has endured the test of time and remains important today.”
The theme of this year's commonwealth day is together we Thrive, which celebrates the 'lasting spirit of the Commonwealth Family'.
The King, who is head of the Commonwealth, gives an annual address to the family of 56 countries every year, but last year a video message recorded, after postponing his public tasks for about three months after the diagnosis of cancer.
The Princess of Wales also missed the service last year, an important event in the Royal Calendar, after he has also been diagnosed with cancer, but will be one of the congregation next to the King, Queen and Prince of Wales.
Kate still makes a gradual return to public tasks after she has said she is in remission.
The address of King Charles will be fully published on Monday for Commonwealth Day when the annual service
The Princess of Wales also missed the service last year, an important event in the Royal Agenda takes place in Westminster Abbey
William, Kate, Charles and Camilla will be accompanied by the Princess Royal and the Hertog and Duchess of Gloucester for the service, said Buckingham Palace.
During the service, singer-songwriter Joan Arrarading will perform an arrangement of its well-known Hitl Love and affection for the 2,000-person municipality.
On the same day, the king launches the inaugural King's Baton Relay in Buckingham Palace, officially starting with the countdown to the Glasgow 2026 Commonwealth games.
It marks the 18th official Commonwealth games and Charles's first as king.
He will place a message in the baton, which is sealed and closed until the opening ceremony next summer, when his words are read to indicate the start of the competition.
Charles will hand over the baton to the first Batond rider, six -time Olympic champion cyclist Sir Chris Hoy.
Sir Chris, who has terminal prostate cancer, runs through the quadrush from the palace to the middle arch, lined along a path by pipers of the Shree Muktajevan Swamibapa Pipe Band London.
Charles and Camilla will also be guests of the Commonwealth Secretary General, Baroness Scotland, during the annual Commonwealth Day reception on Monday and a memorial number of Lord Lloyd-Webber on the occasion of the inaugural Commonwealth Peace Prize.
