Know them which labour among you

What does it mean, “to KNOW them which labour among you”?

"And we beseech you, brethren, to know them which labour among you, and are over you in the Lord, and admonish you; and to esteem them very highly in love for their work's sake." - 1 Thessalonians 5:12-13 KJV

The definition from Thayer’s Greek Lexicon of this word “know,” is the following:

“Hebraistically, εἰδέναι τινα to have regard for one, cherish, pay attention to: 1 Thessalonians 5:12” 

"Remember them which have the rule over you, who have spoken unto you the word of God: whose faith follow, considering the end of their conversation. [Remember your leaders who taught you the word of God. Think of all the good that has come from their lives, and follow the example of their faith.]" - Hebrews 13:7 KJV

"Obey them that have the rule over you, and submit yourselves: for they watch for your souls, as they that must give account, that they may do it with joy, and not with grief: for that is unprofitable for you. [Obey your spiritual leaders, and do what they say. Their work is to watch over your souls, and they are accountable to God. Give them reason to do this with joy and not with sorrow. That would certainly not be for your benefit.]" - Hebrews 13:17 KJV 

"For ye remember, brethren, our labour and travail: for labouring night and day, because we would not be chargeable unto any of you, we preached unto you the gospel of God." - 1 Thessalonians 2:9 KJV

"Therefore said he unto them, The harvest truly is great, but the labourers are few: pray ye therefore the Lord of the harvest, that he would send forth labourers into his harvest." - Luke 10:2 KJV

"Let the elders that rule well be counted worthy of double honour, especially they who labour in the word and doctrine. For the scripture saith, Thou shalt not muzzle the ox that treadeth out the corn. And, The labourer is worthy of his reward." - 1 Timothy 5:17-18 KJV

"And from Miletus he sent to Ephesus, and called the elders of the church... Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood." - Acts 20:17, 28 KJV