How do we know that there are Kenites in Israel?

The Kenites will simply receive the Antichrist in the end times.

Daniel 11:20-23
20 Then shall stand up in his estate a raiser of taxes in the glory of the kingdom: but within few days he shall be destroyed, neither in anger, nor in battle.
21 And in his estate shall stand up a vile person, to whom they shall not give the honour of the kingdom: but he shall come in peaceably, and obtain the kingdom by flatteries.
22 And with the arms of a flood shall they be overflown from before him, and shall be broken; yea, also the prince of the covenant.
23 And after the league made with him he shall work deceitfully: for he shall come up, and shall become strong with a small people.
KJV

The Kenites are to Antichrist what John the Baptist was to the true Christ.

1 Chronicles 2:55
55 And the families of the scribes which dwelt at Jabez; the Tirathites, the Shimeathites, and Suchathites. These are the Kenites that came of Hemath, the father of the house of Rechab.
KJV
Jeremiah 35:8-11
8 Thus have we obeyed the voice of Jonadab the son of Rechab our father in all that he hath charged us, to drink no wine all our days, we, our wives, our sons, nor our daughters;
9 Nor to build houses for us to dwell in: neither have we vineyard, nor field, nor seed:
10 But we have dwelt in tents, and have obeyed, and done according to all that Jonadab our father commanded us.
11 But it came to pass, when Nebuchadrezzar king of Babylon came up into the land, that we said, Come, and let us go to Jerusalem for fear of the army of the Chaldeans, and for fear of the army of the Syrians: so we dwell at Jerusalem.
KJV

Genesis 4:9-11
9 And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?
10 And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.
11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;
12 When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth.
KJV

Acts 19:13
13 Then certain of the vagabond Jews, exorcists, took upon them to call over them which had evil spirits the name of the Lord Jesus, saying, We adjure you by Jesus whom Paul preacheth.
KJV
Revelation 2:9
9 I know thy works, and tribulation, and poverty, (but thou art rich) and I know the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan.
KJV
Revelation 3:9
9 Behold, I will make them of the synagogue of Satan, which say they are Jews, and are not, but do lie; behold, I will make them to come and worship before thy feet, and to know that I have loved thee.
KJV