New Revised Standard Version
When the prince provides a freewill offering, either a burnt offering or offerings of well-being as a freewill offering to the LORD, the gate facing east shall be opened for him; and he shall offer his burnt offering or his offerings of well-being as he does on the sabbath day. Then he shall go out, and after he has gone out the gate shall be closed.

Contemporary English Version
If the ruler voluntarily offers a sacrifice to please me or to ask my blessing, the east gate of the inner courtyard will be opened for him. He will offer his sacrifices just as he does on each Sabbath; then he will leave, and the gate will be closed.

New American Bible
When the prince makes a freewill offering to the LORD, whether a burnt offering or communion offering, the gate facing east shall be opened for him, and he shall bring his burnt offering or peace offering as he does on the sabbath. Then he shall leave, and the gate shall be closed after his departure.

Douay-Rheims Bible
But when the prince shall offer a voluntary holocaust, or voluntary peace offering to the Lord: the gate that looketh towards the east shall be opened to him, and he shall offer his holocaust, and his peace offerings, as it is wont to be done on the sabbath day: and he shall go out, and the gate shall be shut after he is gone forth.

But when the prince shall offer a voluntary holocaust, or voluntary peace offering to the Lord: the gate that looketh towards the east shall be opened to him, and he shall offer his holocaust, and his peace offerings, as it is wont to be done on the sabbath day: and he shall go out, and the gate shall be shut after he is gone forth.

a voluntary

Leviticus 1:3 If his offering be a holocaust, and of the herd, he shall offer a male without blemish, at the door of the testimony, to make the Lord favourable to him.

Leviticus 23:38 Besides the sabbaths of the Lord, and your gifts, and those things that you offer by vow, or which you shall give to the Lord voluntarily.

Numbers 29:39 These things shall you offer to the Lord in your solemnities: besides your vows and voluntary oblations for holocaust, for sacrifice, for libation, and for victims of peace offerings.

1 Kings 3:4 He went therefore to Gabaon, to sacrifice there: for that was the great high place: a thousand victims for holocausts, did Solomon offer upon that altar, in Gabaon.

1 Chronicles 29:21 And they sacrificed victims to the Lord: and they offered holocausts the next day, a thousand bullocks, a thousand rams, a thousand lambs, with their libations, and with every thing prescribed most abundantly for all Israel.

2 Chronicles 5:6 And king Solomon and all the assembly of Israel and all that were gathered together before the ark, sacrificed rams, and oxen without number: so great was the multitude of the victims.

2 Chronicles 7:5-7 And king Solomon offered a sacrifice of twenty-two thousand oxen, and one hundred and twenty thousand rams: and the king and all the people dedicated the house of God. . . .

2 Chronicles 29:31 And Ezechias added, and said: You have filled your hands to the Lord, come and offer victims, and praises in the house of the Lord. And all the multitude offered victims, and praises, and holocausts with a devout mind.

Ezra 1:4 And let all the rest in all places wheresoever they dwell, help him every man from his place, with silver and gold, and goods, and cattle, besides that which they offer freely to the temple of God, which is in Jerusalem.

Ezra 3:5 And afterwards the continual holocaust, both on the new moons, and on all the solemnities of the Lord, that were consecrated, and on all in which a freewill offering was made to the Lord.

Ezra 6:17 And they offered at the dedication of the house of God, a hundred calves, two hundred rams, four hundred lambs, and for a sin offering for all Israel twelve he goats, according to the number of the tribes of Israel.

Romans 12:1 I beseech you therefore, brethren, by the mercy of God, that you present your bodies a living sacrifice, holy, pleasing unto God, your reasonable service.

Ephesians 5:2 And walk in love, as Christ also hath loved us and hath delivered himself for us, an oblation and a sacrifice to God for an odour of sweetness.

open him

Ezekiel 46:1,2,8 Thus saith the Lord God: The gate of the inner court that looketh toward the east, shall be shut the six days, on which work is done; but on the sabbath day it shall be opened, yea and on the day of the new moon it shall be opened. . . .

Ezekiel 44:3 For the prince. The prince himself shall sit in it, to eat bread before the Lord: he shall enter in by the way of the porch of the gate, and shall go out by the same way.

as he did

Ezekiel 45:17 And the prince shall give the holocaust, and the sacrifice, and the libations on the feasts, and on the new moons, and on the sabbaths, and on all the solemnities of the house of Israel: he shall offer the sacrifice for sin, and the holocaust, and the peace offerings to make expiation for the house of Israel.