Because they lived in an area called Yahuda

Yaqoob( as) was known as Yahuda

Yahuda was eldest son of Yaqoob(as) ,the 12 tribes from this generation came to be known as Yahud or Jews

And from the name Jews, their religion came to be known as Judaism

From the word Nusra which means worship

From the name Nazareth, the city where Isa( as) belonged

From the word Nusra which means help

The mushriq of macca called the believers Sabians

They were the ummah of Yahya( as)

They read the Zaboor but worshipped Angels

To follow the commands given in the Taurah

To fulfill the commands with firmness

To implement and mention

The Bani Israel were commanded not to work on Saturday so they put their fishing nets on Friday itself

And on Sunday, they would take the fish out

Therefore technically they were not fishing on Saturday

To know who the culprit was, who had killed a man from the Bani Israel

To remove the love of the cow from the their hearts

To complicate the matter for the Bani Israel

Their attitude towards their Prophet was non serious

They disrespected and disregarded Musa( as )

They even took the commands of Allah lightly

You are eager

You are lazy and don't wish to do the work

You have a non serious attitude

You don't consider it important enough

Their attitude towards their Prophet was a careless

After witnessing the dead man brought back to life , it didn't make them repent and turn to Allah

They didn't reflect on the Taurah instead objected and questioned the commands of Allah

Soms Rocks from which rivers gush out

Rocks which when break, water comes out of them

Some Rocks which fall down with the fear of Allah

Like the 1st rocks some people have the ability to do a lot of good deeds and thus benefit a lot of people through their good deeds

Like the 2nd rock some people are able to do only a few good deeds

The 3rd rock, such people if required let go of their ego, fall down in humility for the sake of Allaah