The same way He knew all His future disciples, as well as many others... He grew up with these contemporaries of His in Judaea.
As His father, Joseph's, legally firtstborn son... when Joseph presumably died [since he doesn't appear in the gospel accounts] Jesus inherited all of Joseph's possessions... including Joseph's carpentry profession, a contract construction business.
He would have inherited his father's house in Nazareth and become the head of the household and "CEO" of [Joseph and Sons Construction], as it were.
He and his brothers and sisters and mother would have worked the business and have been known throughout Judaea... including in Capernaum... a city where the wealthy of the day lived [where Jesus Himself lived... perhaps in a house built by His construction company].
''A few days later, when Jesus again entered Capernaum, the people heard that He had COME HOME." (Mark 2:1)
Jesus was a wealthy and influential man in Judaea... not a "penniless street-beggar" as some denominations teach. People called Him "Master" and "Teacher." Penniless and homeless street-beggars aren't addressed that way.
He was known by many people... and He knew them. Judas was a crooked and shady dealer. And his reputation would not have been a big secret.
By men's works and labor are they known.
"Wherefore by their fruits ye shall know them." (Matt.7:20)
Jesus had two disciples called Judas. One was Judas Iscariot, the other was just called Judas. Judas Iscariot is not known as Jesus brother, actually, he was the follower of Jesus that betrayed him to the Pharisees.
Not normally, because there were two disciples of Jesus with the names Judas. The Judas that betrays Jesus is generally called Judas iscariot so you can tell them apart.
Judas Iscariot
It was Judas Iscariot.
The disciple was Judas Iscariot.
Judas betrayed Jesus once. Peter denied Jesus 3 times.
The disciple who betrayed Jesus was Judas Iscariot.
Jesus had two disciples called Judas. One was Judas Iscariot, the other was just called Judas. Judas Iscariot is not known as Jesus brother, actually, he was the follower of Jesus that betrayed him to the Pharisees.
Judas Iscariot was the one who betrayed Jesus.
Judas Iscariot
Judas Iscariot was the disciple that betrayed Jesus. See these verses in the Bible: Luke 22:47-48 and John 18:1-5
Judas iscariot betrays Jesus
Not normally, because there were two disciples of Jesus with the names Judas. The Judas that betrays Jesus is generally called Judas iscariot so you can tell them apart.
Judas Iscariot
Judas Iscariot.
Judas Iscariot
Judas Iscariot.