Jesus said:
When you behold
Him who was not begotten of woman
prostate yourselves upon your face
and worship him;
that one is your Father. [logion 15]
Behold has a very different meaning to seeing or looking. Its more profound; the Oxford Dictionary defines the source as bi- ‘thoroughly’ + haldan ‘to hold’. So to behold is to “clearly envisage and know for-certain” something; an unshakeable image.
In the next line anything 'not begotten of woman' rules out the concept of 'supernatural' or imaginary beings including mortal humans. When Jesus refers to 'Father' in the last line, then we know that he was speaking to Jewish listeners who understood this concept. He did not use 'God' nor 'Jehovah', so although the Christian world recognizes “Father” as God it should not be interpreted as that. So it seems likely that this is not an instruction to worship God.
Everyone worships. Today many worship money, power, beauty, celebrity, etc. If they worship money and things then they will never have enough and never feel they have enough. When they worship power to avoid feeling weak or fearful then they need complete control of everything and everybody. The problem is that external events have a much greater impact on their small sphere of influence that renders them powerless. When celebrity is worshiped and individuals treated as role models then the inevitable drop from 'A' list to 'no-list' will destroy them. If they worship body, beauty, and allure then they always feel 'ugly' or over-weight and strive to remove these 'blemishes'. They die a million deaths whenever they look in the mirror and see that time and age cannot be avoided.
These forms of worship may appal you, but modern society is powered by every type of media to such an extent that it can become an unconscious awareness. It drips-drips into our minds and if followed will lead to great disappointment.
At the heart of all religions is the concept of worship of a spiritual-type being be it God, Jesus, Allah, Jehovah, Krishna or whatever. Most of us choose our religion. Its made up of a set of ethical principles and a framework in which to live which we use these to provide meaning to our lives. It also involves rituals some of which Jesus did pass comment; when the disciples questioned Jesus (logion #6) he made clear that they would harm their spirit (logion 14).
The formal structure of religious meetings usually involves group-led prayer, sermons, and singing praises. We call this "worship". This does seem to be the worship that Jesus describes in logion 15!
Jesus in ‘Thomas’ teaches us that we alone have to change our knowing: “métanoïa”. We don't do it in groups, we have to work to overcome our ahamkara (ego) through inward reflection and contemplation. We have to 'know ourselves'. When we know ourselves, then we can start to worship.
Worship is waiting: being still from your own thoughts, imaginations, desires, emotions, and wills. Then and only then will we be able to prostrate ourselves to our Father. This is the worship that Jesus wishes us to follow.