For example, Hebrews 1, Verse 8-12:
8 But of the Son he says, “Your throne, O God, is forever and ever, the scepter of uprightness is the scepter of your kingdom. 9 You have loved righteousness and hated wickedness; therefore God, your God, has anointed you with the oil of gladness beyond your companions.” 10 And, “You, Lord, laid the foundation of the earth in the beginning, and the heavens are the work of your hands; 11 they will perish, but you remain; they will all wear out like a garment, 12 like a robe you will roll them up, like a garment they will be changed. But you are the same, and your years will have no end.”
Here, in context, the writer of the epistle to the Hebrews makes a comparison between the Son and the angels, and quotes passages out of the Old Testament to prove it. In the example I provided, he quotes two passages of the Psalms (Psalm 45 and Psalm 102, separated by the red And) and applies them to the Son. The second quotation is important here. He quotes from Psalm 102 Verses 25-27. But if you read the whole Psalm from the beginning, you will realise that this Psalm is actually a prayer from the Psalmist to the LORD, YHWH, the Tetragrammaton. It begins this way:
Hear my prayer, O Lord; let my cry come to you!
What is translated "Lord" here, is, in the original, יהוה, that is, YHWH. So, the inspired writer of this epistle to the Hebrews applies statements out of the Old Testament, which are references to YHWH, directly to Jesus, who is the Son.