Wikipedia
Vayelech, Vayeilech, VaYelech, Va-yelech, Vayelekh, Va-yelekh, or Vayeleh ( — Hebrew for "then he went out", the first word in the parashah) is the 52nd weekly Torah portion (, parashah) in the annual Jewish cycle of Torah reading and the ninth in the Book of Deuteronomy. It constitutes With just 30 verses, it has the fewest verses of any parashah, although not the fewest words or letters. (Parashah V'Zot HaBerachah has fewer letters and words.)
Jews generally read it in September or early October (or rarely, in late August). The lunisolar Hebrew calendar contains up to 55 weeks, the exact number varying between 50 in common years and 54 or 55 in leap years. In some leap years (for example, 2015, 2016, 2018, 2019, 2021, 2022, and 2025), Parashah Vayelech is read separately. In common years (for example, 2017, 2020, 2023, 2024, 2026, and 2027), Parashah Vayelech is combined with the previous parashah, Nitzavim, to help achieve the number of weekly readings needed, and the combined portion is then read on the Sabbath immediately before Rosh Hashanah. The two Torah portions are combined except when two Sabbaths fall between Rosh Hashanah and Sukkot and neither Sabbath coincides with a Holy Day.
In the parashah, Moses tells the Israelites to be strong and courageous, as God and Joshua would soon lead them into the Promised Land. Moses commanded the Israelites to read the law to all the people every seven years. God told Moses that his death was approaching, that the people would break the covenant, and that God would thus hide God's face from them, so Moses should therefore write a song to serve as a witness for God against the Israelites.