「拜」was originally「𢳎」, comprised of「手・扌」and「𠦪」.
「𠦪」(please read this in both meaning and sound as「禱」) depicts flowery adornments used in dances and religious prayer/rituals.
The combination of「手」(hand) and「𠦪」(flowery adornments used in dances and religious prayer/rituals) indicated the meaning to conduct obeisance.
In the character「𢳎」, the bottom part of「𠦪」was sometimes corrupted into something that looked like「手」.
Similarly, the top part of「𠦪」, which is「卉」, was sometimes removed. This leads on to the modern form of「拜」.