A convalescing Pope Francis has greeted the crowd in St_ Peter’s Square on Palm Sunday, wishing more than 20,000 faithful a “Good Palm Sunday, a good Holy Week."

The Argentinian pope is entering his fourth week of convalescence during which doctors have advised him to avoid crowds.

Pope Francis made a surprise second appearance Thursday at St. Peter’s Basilica in the Vatican, arriving in a wheelchair around 12:30 p.m. local time. In videos posted on social media, Pope Francis is seen without his usual white cassock and skullcap, wearing dark pants and a white shirt covered with a striped poncho.