New Revised Standard Version
The LORD said to me: Mortal, mark well, look closely, and listen attentively to all that I shall tell you concerning all the ordinances of the temple of the LORD and all its laws; and mark well those who may be admitted to the temple and all those who are to be excluded from the sanctuary.

Contemporary English Version
The LORD said: Ezekiel, son of man, I am going to give you the laws for my temple. So pay attention and listen carefully to what kind of people are allowed to come in the temple, and what kind are not.

New American Bible
The LORD said to me: Son of man, pay close attention, look carefully, and listen intently to everything I tell you about all the statutes and laws of the LORD’s house. Pay close attention to the entrance into the temple and all the exits of the sanctuary.

Douay-Rheims Bible
And the Lord said to me: Son of man, attend with thy heart and behold with thy eyes, and hear with thy ears, all that I say to thee concerning all the ceremonies of the house of the Lord, and concerning all the laws thereof: and mark well the ways of the temple, with all the goings out of the sanctuary.

And the Lord said to me: Son of man, attend with thy heart and behold with thy eyes, and hear with thy ears, all that I say to thee concerning all the ceremonies of the house of the Lord, and concerning all the laws thereof: and mark well the ways of the temple, with all the goings out of the sanctuary.

mark well [heb] set thine heart

Ezekiel 40:4 And this man said to me: Son of man, see with thy eyes, and hear with thy ears, and set thy heart upon all that I shall shew thee: for thou art brought hither that they may be shewn to thee: declare all that thou seest, to the house of Israel.

Exodus 9:21 But he that regarded not the word of the Lord, left his servants, and his cattle in the fields.

Deuteronomy 32:46 And he said to them: Set your hearts on all the words, which I testify to you this day: which you shall command your children to observe and to do, and to fulfil all that is written in this law:

1 Chronicles 22:19 Give therefore your hearts and your souls, to seek the Lord your God and arise, and build a sanctuary to the Lord God, that the ark of the covenant of the Lord, and the vessels consecrated to the Lord, may be brought into the house, which is built to the name of the Lord.

2 Chronicles 11:16 Moreover out of all the tribes of Israel, whosoever gave their heart to seek the Lord the God of Israel, came into Jerusalem to sacrifice their victims before the Lord the God of their fathers.

Proverbs 24:32 Which when I had seen, I laid it up in my heart, and by the example I received instruction.

Daniel 10:12 And he said to me: Fear not, Daniel: for from the first day that thou didst set thy heart to understand, to afflict thyself in the sight of thy God, thy words have been heard: and I am come for thy words.

concerning

Ezekiel 43:10,11 But thou, son of man, shew to the house of Israel the temple, and let them be ashamed of their iniquities, and let them measure the building: . . .

Deuteronomy 12:32 What I command thee, that only do thou to the Lord: neither add any thing, nor diminish.

Matthew 28:20 Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world.

and mark well

Psalm 119:4 Thou hast commanded thy commandments to be kept most diligently.

the entering

Psalm 96:8,9 Bring to the Lord glory unto his name. Bring up sacrifices, and come into his courts: . . .

Acts 8:37 And Philip said: If thou believest with all thy heart, thou mayest. And he answering, said: I believe that Jesus Christ is the Son of God.