Mark 9:18

9:18 Whenever it seizes him, it throws him down, and he foams at the mouth, grinds his teeth, and becomes rigid. I asked your disciples to cast it out, but ¹  they were not able to do so.” ² 

[9:18]  ¹ tn Here καί (kai) has been translated as “but” to indicate the contrast present in this context.

[9:18]  ² tn The words “to do so” are not in the Greek text, but have been supplied for clarity and stylistic reasons.