Midrasch zu Jeschijahu 39:6

6 "And Balak saw" (Numbers 22:2) When his messengers came to Bilaam, the Holy One, blesed be He, said to him, "Who are these people" (Numbers 22:9). Bilaam said to him, (Numbers 22:10), "Balak son of Beor, king of Moav, sent to me." Rabbi Abba bar Kahana said, "This is one of three people that the Holy One, blessed be He, examined and found to be a carriage of urine: Kayin, Chizkiyah and Bilaam. Kayin - at the time that the Holy One, blessed be He, said, 'Where is Hevel, your brother' (Genesis 4:9), he sought to - as if it were possible - deceive Him. He should have said, 'Master of the world, the hidden things and the revealed things are revealed in front of You, and You ask me about me about my brother?' Instead he said to Him (Genesis 4:9), 'I do not know; am I my brother's keeper?' The Holy One, blessed be He, said to him, 'By your life, this is how you spoke? "The blood of your brother is crying out."' Chizkiyah - when he got up (recovered) from his illness, Merodach-baladan sent him a gift - as it is stated (Isaiah 39:1), 'At that time, Merodach-baladan, sent' - Yishayah came [and] said to him, 'What did those people say, and from where did they come to you.' He should have said, 'You are a prophet of the Omnipresent, and you ask me?' Instead he began to be haughty and said (Isaiah 39:3), 'From a distant land; they have come from Babylonia.' Isaiah said, 'Since you have spoken like this (Isaiah 39:6-7), "Days are coming when everything in your palace, will be carried off [...]. And some of your sons, your own issue, whom you will have fathered, will be taken to serve as eunuchs in the palace of the king of Babylonia."' And likewise Bilaam the evildoer - at the time that Balak sent to him, the Holy One, blessed be He, said to him, 'Who are these people with you'; he should have said, 'Master of the world, 'Everything is revealed in front of You and there is not anything hidden from you, and You ask me?' Instead, he said to Him (Numbers 22:10), 'Balak son of Beor, king of Moav, sent to me.' The Holy One, blessed be He, said to him, 'Since you speak to Me like this (Numbers 22:12), "you may not curse the nation."' The Holy One, blessed be He, said, 'Evildoer of the world, it is written about Israel (Zechariah 2:12), "since one who touches you is like one who touches the pupil of his eye," and you are going to touch them and curse them? His eye shall be removed.' As it is stated (Numbers 24:3), 'with the shut eye,' to fulfill, whoever 'touches them is like one who touches the pupil of his eye.'"

And Hezekiah saw the messengers, and his heart was puffed with pride, and he showed them all the treasures of the kings of Judah, and all the treasures of the Holy of Holies in the Temple, and further, he opened the Ark of the Covenant, and he showed them the tables of the Law, and he said to them: With this do we wage war and conquer, as it is said, "And Hezekiah was glad of them, and shewed them the house of his precious things" (Isa. 39:2). The Holy One, blessed be He, was angry with him, and He said to him: Was it not enough for thee to have shown them all the treasures of the kings of Judah and all the treasures of the Holy of Holies? Moreover, thou hast opened for them the Ark, and hast shown them the tables, the work of My hand. By thy life! They shall come up and take away all the treasures of the kings of Judah, and all the treasures of the Holy of || Holies, as it is said, "Behold, the days come, that all that is in thine house, and that which thy fathers have laid up in store until this day, shall be carried to Babylon" (Isa. 39:6). Instead of the tables of the Law, they shall take of thy sons to be eunuchs in the palace of the king of Babylon, as it is said, "And of thy sons that shall issue from thee, which thou shalt beget, shall they take away; and they shall be eunuchs in the palace of the king of Babylon" (Isa. 39:7). These were Hananiah, Mishael, and Azariah, who were made eunuchs in the palace of the king of Babylon, and they did not beget children. Concerning them the Scripture says, "For thus saith the Lord to the eunuchs that keep my sabbaths,… Unto them will I give in mine house and within my walls a memorial and a name better than of sons and of daughters; I will give them an everlasting name, that shall not be cut off" (Isa. 56:4, 5).