The market adage 'Sell Rosh Hashanah, Buy Yom Kippur' has made a dramatic return in 2023. The strategy, which suggests selling stocks before the Jewish holidays and buying them back after, has yielded positive results in 2021 and 2022. This year, the commencement of Rosh Hashanah coincides with September’s quadruple witch expiration, which could lead to extra volatility. The SPDR S&P 500 ETF Trust (NYSE:SPY) opened at $447.15 on Friday. The S&P 500 index has shown resilience this year despite rapidly rising interest rates and economic challenges.