Arcana Coelestia # 9635
9635. 'From shittim wood' means that it is the good of merit from the Lord's Divine Human. This is clear from the meaning of 'shittim wood' as the good of merit from the Lord's Divine Human, dealt with in 9472, 9486, this good being the one and only good that reigns in and supports heaven, see 9486.
Exodus 26:12
12
The overhanging part that remains of the curtains of the tent, the half curtain that remains, shall hang over the back of the tabernacle.