Then by all the apostles — The twelve were mentioned 1 Corinthians 15:5. This title here, therefore, seems to include the seventy; if not all those, likewise, whom God afterwards sent to plant the gospel in heathen nations.
Related Commentaries of 1 Corinthians 15:7
1 Corinthians 15:7
7 After that, he was seen of James; then of all the apostles.