They stoned (elithoboloun). Same verb and tense repeated, they kept on stoning, they kept it up as he was calling upon the Lord Jesus and making direct prayer to him as “Lord Jesus” (Kurie Iēsou).
Receive my spirit (dexai to pneuma mou). Aorist middle imperative, urgency, receive it now. Many have followed Stephen into death with these words upon their dying lips. See, Act 9:14, Act 9:21; Act 22:16.