John Gill Commentary Mark 15:31

"In like manner also the chief priests mocking [him] among themselves with the scribes said, He saved others; himself he cannot save." — Mark 15:31 (ASV)

Likewise also the chief priests mocking Or "laughed at one another", as the Syriac version renders it, having gained their point, and satiated their revenge on him:

said among themselves with the Scribes ; who were likewise his implacable enemies;

he saved others, himself he cannot save; (See Gill on Matthew 27:41), (See Gill on Matthew 27:42).