There is no mention in the scripture of Elijah coming again in these last days – he is not one of the two witnesses who would do their powerful ministry in the last days and die as martyrs because of their testimony. While these two witnesses would perform miracles as did Elijah (stop rain or bringing down fire from heaven), this is more spiritual than literal. And they are already doing it now as the two olive branches and two candlesticks representing the believing Jews and the believing gentiles of Rom 11:17:2 and the two anointed ones of Zac 4:14.