First, decide on your asset allocation; are you looking for a fund with 60% stocks/risky-stuff, or 40% or 20%?
Second, look for funds that have a mix of stocks and bonds. Good keywords would be: "target retirement," "lifecycle," "balanced," "conservative/moderate allocation." As you discover these funds, probably the fund website (but at least Morningstar.com) will tell you the percentage in stocks and risk assets, vs. in conservative bonds. Look for funds that have the percentage you decided on, or as close to it as possible.
Third, build a list of funds that meet your allocation goal, and compare the details. Are they based on index funds, or are they actively managed? What is the expense ratio? Is the fund from a reputable company? You could certainly ask more questions here if you have several candidates and aren't sure how to choose.
For investing in US dollars one can't-go-wrong choice is Vanguard and they have several suitable funds, but unfortunately if you spend in NIS then you should probably invest in that currency, and I don't know anything about funds in Israel.
Update: two other options here. One is a financial advisor who agrees to do rebalancing for you. If you get a cheap one, it could be worth it. Two is that some 401k plans have an automatic rebalancing feature, where you have multiple funds but you can set it up so their computer auto-rebalances you. That's almost as good as having a single fund, though it does still encourage some "mental accounting" so you'd have to try to only look at the total balance, not the individual fund balances, over time. Anyway both of these could be alternatives ways to go on autopilot, besides a single fund.