Arcana Coelestia #3852
3852. 'And he served with him yet another seven years' means holy diligent effort. This is clear from the meaning of 'serving' as diligent effort, dealt with in 3824, 3846, and from the meaning of 'seven' as that which is holy, dealt with in 395, 433, 716, 881, 3824. The expression 'holy diligent effort' is used for that effort by means of which internal truths are joined to good, for internal truths in every case regard the Lord and are joined to a person by means of love to Him. This love is holiness itself.
Leviticus 25:8-9
8
"'You shall count off seven Sabbaths of years, seven times seven years; and there shall be to you the days of seven Sabbaths of years, even forty-nine years.
9
Then you shall sound the loud trumpet on the tenth day of the seventh month. On the day of Atonement you shall sound the trumpet throughout all your land.