Matthew Poole and continuators on Luke 6:5

5 And he said unto them, That the Son of man is Lord also of the sabbath.

See the Notes on Matth. 12.1, 2, 3. and on Mark 2.23, 24. There are several guesses what day is here meant, by the second Sabbath after the first. The Jews had several Sabbaths, besides the seventh day Sabbath which was weekly, all their Festival Days were called Sabbaths. In the fourteenth Day of the first Month, at even began the Passover, on the fifteenth Day began their Feast of Vnleavened Bread, which held seven Days, every one of which was called a Sabbath; but the first Day, and the seventh Day, were to be Days of Holy Convocation, in which no work was to be done that was servile, Lev. 23.7. Then they had their Feast of first Fruits. Fifty Days after that they had their Feast of Pentecost. Some understand by the second Sabbath after the first, the seventh Day of the Feast of Vnleavened Bread. Others their second great Festival. It is very hard to resolve, and not material for us to know. For the History it self see the explication in the Notes on Matth. 12.1, 2, 3, 4.