1“Now, you priests, this commandment is for you. 2If you will not listen, and if you will not take it to heart, to give glory to my name,” says Yahweh of Armies, “then I will send the curse on you, and I will curse your blessings. Indeed, I have cursed them already, because you do not take it to heart. 3Behold, I will rebuke your offspring, and will spread dung on your faces, even the dung of your feasts; and you will be taken away with it. 4You will know that I have sent this commandment to you, that my covenant may be with Levi,” says Yahweh of Armies. 5“My covenant was with him of life and peace; and I gave them to him that he might be reverent toward me; and he was reverent toward me, and stood in awe of my name. 6The law of truth was in his mouth, and unrighteousness was not found in his lips. He walked with me in peace and uprightness, and turned many away from iniquity. 7For the priest’s lips should keep knowledge, and they should seek the law at his mouth; for he is the messenger of Yahweh of Armies. 8But you have turned away from the path. You have caused many to stumble in the law. You have corrupted the covenant of Levi,” says Yahweh of Armies. 9“Therefore I have also made you contemptible and wicked before all the people, according to the way you have not kept my ways, but have had respect for persons in the law. 10Don’t we all have one father? Hasn’t one God created us? Why do we deal treacherously every man against his brother, profaning the covenant of our fathers? 11Judah has dealt treacherously, and an abomination is committed in Israel and in Jerusalem; for Judah has profaned the holiness of Yahweh which he loves, and has married the daughter of a foreign god. 12Yahweh will cut off the man who does this, him who wakes and him who answers, out of the tents of Jacob and him who offers an offering to Yahweh of Armies.
13“This again you do: you cover Yahweh’s altar with tears, with weeping, and with sighing, because he doesn’t regard the offering any more, neither receives it with good will at your hand. 14Yet you say, ‘Why?’ Because Yahweh has been witness between you and the wife of your youth, against whom you have dealt treacherously, though she is your companion and the wife of your covenant. 15Did he not make you one, although he had the residue of the Spirit? Why one? He sought godly offspring. Therefore take heed to your spirit, and let no one deal treacherously against the wife of his youth. 16One who hates and divorces”, says Yahweh, the God of Israel, “covers his garment with violence!” says Yahweh of Armies. “Therefore pay attention to your spirit, that you don’t be unfaithful.
17You have wearied Yahweh with your words. Yet you say, ‘How have we wearied him?’ In that you say, ‘Everyone who does evil is good in Yahweh’s sight, and he delights in them;’ or ‘Where is the God of justice?’
Jacob was the son of Isaac and Rebekah, born immediately after Esau, and Abraham was his grandfather. He achieved the right of the firstborn by trickery, in offering his older brother, Esau, food in exchange for the birthright, who cared little for this position. He also received the blessing of firstborn from his father Jacob before his death by cunning, and with the assistance of his mother Rebekah.
After his deception of Esau, receiving the blessing from his father, Jacob escaped to his uncle Laban, who in turn deceived Jacob into working for fourteen years for the marriage of Jacob to Leah, and then his beloved Rachel. Laban also sought to deceive Jacob of wages, but God intervened to ensure he would prosper. In a time of trial, when he feared the wrath of Esau, upon returning to the land of Canaan, Jacob had an encounter with God, and his name was changed to Israel, the one who wrestles with God. Even though his early life was characterized by deception, God worked through the situation to ensure that Jacob would be the one in the line of the patriarchs, to create a great nation and ultimately fulfill His purposes in the earth, especially through the future Messiah. The Messiah would guarantee the promise of the land to Abram and a person who would rule over Abraham's descendants, but also He would bring blessings to all the people of the earth (Gen 12:1-3).
In spite of Jacob's early failure by deception, God worked through him, and finally, Jacob became a different type of man after his struggle with God. As one has said,
"Despite Jacob’s faults, God chose him to be the leader of a great nation that still bears his name today. But for this, it is unlikely that we would know much about Jacob, who appears to be in the middle of events while the key players are those around him. There is no great wisdom or bravery in Jacob to speak of, and we are tempted to see him as little more than God’s passive instrument. If we are tempted to think that, because we aren’t in the spotlight performing great acts for God, we are unimportant to Him, then we should consider the life of Jacob and know that, in spite of our failings, God can and will still use us in His plan."
For more on Jacob, see "Who was Jacob in the Bible?", https://www.gotquestions.org/life-Jacob.html