Atos 15

33 After some time, they were released with peace from the brothers to the apostles.*Verse 34, as in the AV, is to be found in about 30% of the Greek manuscripts, but contradicts verse 33, that seems to require that Silas returned to Jerusalem; "they were sent back…to the apostles", and "they" refers to Judas and Silas. The ‘problem’ is that in verse 40 Paul chooses Silas to accompany him, so he had to be in Antioch, not Jerusalem. Accordingly the longer reading was created to solve the ‘problem’. The "some days" of verse 36 could well have been a month or two. From Antioch to Jerusalem would be a trip of less than 400 miles. Silas had time to go to Jerusalem and get back to Antioch.