7 years of shmittah
7×7 years to yoivel
7 midos listed in sefirah-chessed, malchus etc.
7 days before a behaimah is rauy for a korban. This is to insure that a korban will have “experienced” a shabbos and thus be fitting for a korban-as we say in mussaf- tikantuh shabbos rutsisuh kurbunoiseha.
(If shabbos can make a behaimah be fit for a korban, imagine what it can do for a yid)