1 tn The form is the Piel perfect with a vav (ו) consecutive (וּבֵרַכְתֶּם, uverakhtem); coming in the sequence of imperatives this perfect tense would be volitional – probably a request rather than a command.
sn Pharaoh probably meant that they should bless him also when they were sacrificing to Yahweh in their religious festival – after all, he might reason, he did let them go (after divine judgment). To bless him would mean to invoke good gifts from God for him.