Leviticus 6:13

11 Then he must take off his garments, put on other clothes, and carry the ashes outside the camp to a ceremonially clean place.

12 The fire on the altar shall be kept burning; it must not be extinguished. Every morning the priest is to add wood to the fire, arrange the burnt offering on it, and burn the fat portions of the peace offerings on it.

The fire shall be kept burning on the altar continually; it must not be extinguished.

14 Now this is the law of the grain offering: Aaron’s sons shall present it before the LORD in front of the altar.

15 The priest is to remove a handful of fine flour and olive oil, together with all the frankincense from the grain offering, and burn the memorial portion on the altar as a pleasing aroma to the LORD.

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
The fire shall be kept burning on the altar continually; it must not be extinguished.
KJV
The fire shall ever be burning upon the altar; it shall never go out.
WEB
Fire shall be kept burning on the altar continually; it shall not go out.
ASV
Fire shall be kept burning upon the altar continually; it shall not go out.
DARBY
A continual fire shall be kept burning on the altar: it shall never go out.
BLB
A fire continually shall be kept burning on the altar; it shall not be put out.
ÅB
En stadig ild skal holdes tent på alteret; den må ikke slukne.
OTB
Alterilden må forbli tent kontinuerlig; den skal aldri slukkes.
B1930
En stadig ild skal holdes tendt på alteret; den må ikke slukne.

Study notes (Tyndale)

Original text and word study