'Three year' in the Bible

Now when she had weaned him, she took him up with her, along with a three-year-old bull, an ephah of flour, and a leather bottle of wine [to pour over the burnt offering for a sweet fragrance], and she brought Samuel to the Lord’s house in Shiloh, although the child was young.

There was famine in the days of David for three consecutive years; and David sought the presence (face) of the Lord [asking the reason]. The Lord replied, “It is because of Saul and his bloody house, because he put the Gibeonites to death.”

From the outcry at Heshbon even to Elealeh, even to Jahaz they have raised their voice, from Zoar even to Horonaim and Eglath-shelishiyah; for even the waters of Nimrim will become desolations.