These are the ascents that take place on Shabbat night and Shabbat day. On Shabbat night the encompassing levels of Lamed become internal in Zeir Anpin and he is then between the First and Second Maturity. Afterwards on Shabbat day the Mem of the Tzelem also enters into Zeir Anpin’s interior. He thus has the whole of Malchut (i.e. the Second Israel Sabba-Tevunah) – the Tzaddi of the Tzelem – and this is called the Second Maturity. Afterwards there are further ascents, and these are real ascents because Zeir Anpin then rises higher than his proper level. These are the other ascents of Shabbat day. Each one of these times has its effects on the governmental order, because as you know, there is nothing that does not have a purpose.
Zeir Anpin Keeps the Sabbath
Kalach Pitchei Chokhmah 128:12