NET

24 Now I rejoice in my sufferings for you, and I fill up in my physical body—for the sake of his body, the church—what is lacking in the sufferings of Christ.

Darby

24 Now^D8747, I rejoice in sufferings for you, and I fill up^D8748 that which is behind of the tribulations of Christ in my flesh, for his body, which is the assembly;

Darby Bible Notes

Now - He had previously become minister (diakonos, vers. 23,25); he was now in prison, but rejoicing in suffering. up - This refers to what lacked as yet; not to Paul taking 'his turn' as a person, in what is yet lacking.

KJV

24 Who now rejoice in my sufferings for you, and fill up that which is behind of the afflictions of Christ in my flesh for his body's sake, which is the church:

Strong's

24 Who ^G3739 now^G3568 rejoice^G5463 in^G1722 my^G3450 sufferings^G3804 for^G5228 you^G5216, and^G2532 fill up^G466 that which is behind^G5303 of the afflictions^G2347 of Christ^G5547 in^G1722 my^G3450 flesh^G4561 for^G5228 his^G846 body's^G4983 sake^G5228, which is^G3603 the church^G1577: