Matthew 19:27 Then answered Peter and said unto him, Behold, we have forsaken all, and followed thee; what shall we have therefore?

19:28 And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.

Jesus is speaking of the prophetic, kingdom of heaven on earth, which shall be given to Israel. Jesus will sit on his throne, to rule over his kingdom; the twelve disciples will rule with him.

19:29 And every one that hath forsaken houses, or brethren, or sisters, or father, or mother, or wife, or children, or lands, for my name's sake, shall receive an hundredfold, and shall inherit everlasting life.

19:30 But many that are first shall be last; and the last shall be first.

Jesus is saying that the last in earthly position, as were the apostles, would be first in the kingdom. 1 Corinthians 4:9