"When the prince provides a freewill offering to the LORD – whether a burnt offering or fellowship offerings – the gate facing east is to be opened for him. He shall offer his burnt offering or his fellowship offerings as he does on the Sabbath day. Then he shall go out, and after he has gone out, the gate will be shut."
NIV
When the prince shall prepare and make a freewill burnt offering or peace offerings voluntarily to the Lord, the gate that faces east shall be opened for him, and he shall offer his burnt offering and his peace offerings as he does on the Sabbath day. Then he shall go out, and after he has gone out, the gate shall be shut.
AMP
Now when the prince shall prepare a voluntary burnt offering or peace offerings voluntarily unto the LORD, one shall then open him the gate that looketh toward the east, and he shall prepare his burnt offering and his peace offerings, as he did on the sabbath day: then he shall go forth; and after his going forth one shall shut the gate.
KJV