Tzav / Purim

אש תמיד תוקד על המזבח לא תכבה (ו,ו)
A continuous fire shall burn upon the altar; it shall not go out.
The בעל החינוך says that even though a heavenly fire came down it was still a mitzva to bring a regular fire, for it's always better to do things in a normal way than to rely on a נס.
The Mishna in Avos says that there were 10 ניסים that happened in the bais hamikdash. One of them was that even though the מזבח was outside in the open, rain never put out the fire.
Now we need to understand why 'ה made an open miracle like that when he could have just simply not made it rain over the bais hamikdash. While still a miracle, it wouldn't be as obvious.
ביום ההוא נתן המלך אחשורוש לאסתר המלכה את בית המן
The yalkut says that haman's money was split 3 ways - mordechai & esther, the talmidai chachamim & the bais hamikdash.
In theme with the rest of the story of purim, B'derech H'ateva, 'ה took all of Haman's money that he spent a lifetime amassing & gave it to talmidai chachamim who spent their days amassing the wealth of Torah.
Similarly explains הגר"ח מוולאז"ין, all that happens by the Mikdash is symbolic & a lesson to teach us how to live.
The Torah is showing us that if one commits oneself to 'עבודת ה , even though there are situations that might make one want to waiver, you must stay steadfast in your service of 'ה, just like the fire on the מזבח that never went out.
For if one says he doesn't have time to learn because he has to work, the fire on the מזבח is teaching us that if one trusts in 'ה, then even if you take time to learn, you will still have parnasa. We can't let the rain, which is a symbol of parnasa, put out the fire of our Torah. As we see from Haman who worked his whole life to amass a fortune, & then it went to Mordechai & the talmidai chachamim that sat & learned all day. So we see no matter how much wealth you amass, it's still not in our control & it's going to end up going to whomever 'ה wants it to!