2 Corinthians 12:9
9 And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.
Definition of infirmity. 1a : the quality or state of being infirm. b : the condition of being feeble : frailty. 2 : disease, malady. 3 : a personal failing : foible one of the besetting infirmities of living creatures is egotism— A. J. Toynbee.
Lightship Ministries 
Ananias & Saphira ? The spirit of the Lord struck them dead. They went to hell.
The Lord needed to show the importance and reverence in coming to communion in the Holy Spirit without corruption (sin) being harbored within our hearts in the early church. If they were “real” believers, there is no place in that passage which said they were condemned to hell. I believe there is a sin unto death, (God takes us home early) 1 John 5:16; but for the believer this does not indicate going to hell.