"And God said, Let us make (נַֽעֲשֶׂ֥ה: accomplish H6213) man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth." Genesis 1:26
The authority YHVH has given Yeshua is the authority God said He would give mankind when He accomplished making man in His image. Yeshua tells us the reason he has this authority is because he is the son of man.
"For as the Father hath life in himself; so hath he given to the Son to have life in himself;
And hath given him authority to execute judgment also, because he is the Son of man." John 5:26
Because of Yeshua, mankind is receiving the authority that God planned for all of mankind. Yeshua tells us what we have authority over...
"And, behold, they brought to him a man sick of the palsy, lying on a bed: and Jesus seeing their faith said unto the sick of the palsy; Son, be of good cheer; thy sins be forgiven thee.
And, behold, certain of the scribes said within themselves, This man blasphemeth (Mark says "Who can forgive sins but God alone?" The Jews just assumed this, because they did not understand the Scriptures)
And Jesus knowing their thoughts said, Wherefore think ye evil in your hearts?
For whether is easier, to say, Thy sins be forgiven thee; or to say, Arise, and walk?
But that ye may know that the Son of man hath power on earth to forgive sins, (then saith he to the sick of the palsy,) Arise, take up thy bed, and go unto thine house.
And he arose, and departed to his house.
But when the multitudes saw it, they marvelled, and glorified God, which had given such power unto men." Matthew 9:2
Yeshua said mankind has the power to forgive sins. The people rejoiced because such authority has been given to "men".
"But I say unto you, That in this place is [one] greater than the temple.
But if ye had known what this meaneth, I will have mercy, and not sacrifice, ye would not have condemned the guiltless.
For the Son of man is Lord even of the sabbath day." Matthew 12:6
Yeshua says mankind is lord of the Sabbath as well.
"For unto the angels hath he not put in subjection the world to come, whereof we speak.
But one in a certain place testified, saying, What is man, that thou art mindful of him? or the son of man, that thou visitest him?
Thou madest him a little lower than the angels; thou crownedst him with glory and honour, and didst set him over the works of thy hands:
Thou hast put all things in subjection under his feet. For in that he put all in subjection under him, he left nothing that is not put under him. But now we see not yet all things put under him.
But we see Jesus" Hebrews 2:5
We do not see mankind executing their authority over all things. This is because mankind does not yet have the wisdom and prudence to choose good over evil. We have the knowledge, but our hearts are wicked and sick. Yeshua is the express image of God, because he was made in God's image, and he reflects God's purpose for mankind perfectly. Thus, when we believe him and strive to be like him, we likewise become "the sons of God", and Yeshua is not ashamed to call is brothers.
"Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by (δι’: because of-G1223) whom also he made the worlds;
Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;
Being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they." Hebrews 2:2