Shared ground
These verses present a steady worship routine at the tabernacle: incense is burned twice a day, morning and evening, in step with caring for and lighting the lamps (explicit: vv. 7–8). The routine is described as continuing “throughout your generations,” stressing durability, not a one-time event (explicit: v. 8).
The passage also draws firm boundaries around the incense altar. It is not a general-purpose altar: no “strange” (unauthorized) incense, and no burnt, grain, or drink offerings belong there (explicit: v. 9).
Finally, it treats holy objects as needing regular maintenance: once a year, Aaron applies blood from a designated sin offering to the altar’s horns to “make atonement for it,” and the altar is labeled “most holy to Yahweh” (explicit: v. 10).
Where interpretation differs
Two questions get discussed.
First, what counts as “strange incense.” Some read it narrowly as incense with the wrong recipe or ingredients (inference from the idea of authorized composition). Others read it more broadly as any incense offered in an unauthorized way—wrong person, wrong time, or used for a different purpose—even if the ingredients were correct (inference from the strong boundary-setting in v. 9).
Second, what the yearly blood rite is doing. Many take the wording at face value: it “makes atonement for” the altar, meaning the altar is ritually cleansed or decontaminated so it remains fit for holy service (explicit target: “for it,” v. 10; inference about cleansing). Others emphasize that the altar represents the worship system as a whole, so the rite symbolically addresses the people’s accumulated impurity as it affects the sanctuary (inference from how sanctuary cleansing functions elsewhere).
Why the disagreement exists
The key phrases are brief but weighty. “Strange” can mean “not authorized,” but the text does not spell out whether the problem is composition, procedure, or both (pressure point: v. 9). Likewise, “make atonement for it” clearly names the altar as the object, yet the wider sacrificial system often links object-cleansing and people-cleansing, so interpreters ask how far the meaning extends beyond the altar itself (pressure point: v. 10).
What this passage clearly contributes
It shows worship ordered by time (daily morning/evening), by office (Aaron/priestly mediation), and by space (different altars for different acts). The text stresses that holiness involves both continual devotion (perpetual incense) and guarded limits (no mixing offerings). It also introduces the idea that even sacred furniture requires periodic blood-rite “covering/clearing” to remain “most holy,” tying holiness to ongoing, structured maintenance rather than a one-time setup. Exodus 30:7–10