The greek word for ‘GOSPEL’ is Strong’s #2098 (euaggelion) and comes from the same as #2097 (euaggelizo), from where the words ‘evangelist’ and ‘evangelize’ originate. So, an ‘evangelist’ is one who ‘evangelizes’ which is defined as ‘bringing the Good News’ – The Gospel. The Hebrew word for ‘GOSPEL’ is Strong’s #1320 (basar – bayt, sheen, raysh), root of which (interestingly enough) is the word for ‘FLESH’ #3019, having the same Hebrew spelling. By the way, the spelling of that three-letter root is a sermon and ‘Torah Code’ all it’s own.
So, based on the Hebrew, what is ‘The Gospel’? The Promised Messiah has come and taken on ‘Flesh’ to ultimately atone for fleshly man’s sins of the flesh. And if we remember, Hebrew root words are usually verbs – action words – then the Gospel, in an Hebraic sense, is, by definition, something we ‘do’ and ‘publish’ and not just that which we are and that which we exhibit.
What’s The Word say about this? Let’s take a look . . .

‘And Yeshua said to them “Go into all the world and preach The Gospel to ALL creation” . . .’ Mark 16:15

“ . . . The Lord has anointed (Me) to preach The Gospel . . .” Isaiah 61:1 ( a sign of the Messiah)

‘Jesus preached The Gospel in the synagogues . . . Luke 20:1

So why do we need ‘The Gospel’ ?

“For ALL have sinned and fallen short of the Glory of God.” Romans 3:23

“For ALL we, like sheep, have gone astray . . .” Isaiah 53:6

“ . . . for I (YHWH) will renew the covenant with the house of Israel and the house of Judah, the covenant which they broke . . .” Jeremiah 31:31-32

It sounds as if ALL have sinned (transgression of the Torah – 1 John 5:3) and ALL are in need of a Saviour and we are to publish this Gospel to ALL creation. And yet we are told ‘not to evangelize the jews’. So if ALL have sinned ( and we ALL have) and ALL need a personal Lord and Saviour (and we do) and we are commanded by Messiah to publish this Gospel to ALL ( and we have been commanded), so why should the jewish people be segregated from this saving Good News? For in Messiah, there is no difference between Jew and greek, male and female, etc. If Father God is NOT a respecter of persons, why should the jewish people be denied the hearing of the cure for this disease of sin? (Romans 10:14-15). Strange . . . The Word declares ‘all should hear’ and yet we are to told not to publish this Truth to the jews? And we get accused of being ‘anti-semitic . . . strange, indeed . . . Shalom