An emergency fund should be considered essential by anyone considering long-term Bitcoin investment and not wanting to disrupt their Bitcoin balance every time they need cash. However, I recommend everyone have a steady job with a regular income stream so they can manage it carefully, including allocating a portion of their income to an emergency fund and using the rest as capital to buy Bitcoin.
To invest or create an emergency fund, we need a source of discretionary income. If you do it with your fixed income source, it may not be very sustainable. For example,
*Discretionary income is the amount of money left over from your fixed income after deducting all expenses. It is better to invest with discretionary income because you do not need this amount of money very much. The money that is left after meeting all your expenses is discretionary money. If you invest with discretionary income, it becomes much easier for you to maintain it in the long term.
If you do not have an emergency fund, you can create it along with your investments. You can keep some money aside for an emergency fund from the amount of money you wanted to invest from your discretionary income. If you do not have an emergency fund, you can do emergency fund and investment at the same time.
If you invest with fixed income, you may not be able to maintain your investments in the long term. For example, if you need the money, you will have to sell your holdings. So you should invest with discretionary income.