According to Hinduism, Brahma is the creator of the entire cosmic universe. Although he is the creator, he is not worshipped in Hinduism. According to common lore, once Lord Brahma & Lord Vishnu wanted to find who is the best of the two and went to Lord Shiva to settle the argument. Lord Shiva advised the two that the first one to find the start and end of his celestial body would be considered the greatest. Lord Brahma & Lord Vishnu accepted the challenge and started their journey from the centre of Lord Shiva's body. Lord Brahma travelled towards Lord Shiva's head & Lord Vishnu travelled towards the feet. The two gods travelled for ages across the universe, but couldn't find the head or feet of Lord Shiva. On his journey, Lord Brahma came across an Ketaki flower falling from Lord Shiva's head. On querying the distance to Lord Shiva's head, the flower said it had been falling down from his head for eons. Lord Brahma thus realised that it was impossible to reach Shiva's head and decided to cheat. Lord Brahma asked the flower to testify that she had seen Lord Brahma reaching Lord Shiva's head. Lord Brahma went back to Shiva and informed him that he had visited his head (with a testimony from the flower), and requested he be declared as the greater of the two. As an eternal being, Shiva realised that Lord Brahma was not truthful and cursed him that he would not be worshipped by the gods or mortals. Lord Shiva also decreed that aloe vera flowers should never be used for Shiva puja.