A.T. Robertson Commentary Romans 9:28

"for the Lord will execute [his] word upon the earth, finishing it and cutting it short." — Romans 9:28 (ASV)

Finishing it and cutting it short (συντελων κα συντεμνων). Present active participles and note συν- with each (perfective use of the preposition, finishing completely as in Lu 4:13, cutting off completely or abridging and here only in N.T.) The quotation is from Isa 28:22.