Analysis of information sources in references of the Wikipedia article "Khalsa" in English language version.
His was in fact a mimetic violence where the goats were killed instead of the Sikhs.
Eventually he took five men forward and took them behind the tent. Gobind reappeared with a dripping sword: later it was revealed that he slaughtered five goats.
The ten Gurus organised their disciples into sangats and infused their personality again into the Sikhs. This led to a remarkable development in the institution of 'Guru-ship', which eventually became the Guru Panth, thus bestowing divinity on the people. ... The Sikh assemblies also acquired great sanctity, owing to the belief that the spirit of the Guru lived and moved among them collectively, the whole body being called the panth. This panth follows the path shown by the way the Gurus lived their lives, as also the precepts laid down by them. In turn, it is regarded as an embodiment of the Guru—Guru Panth. In 1699, Guru Gobind Singh, the tenth Guru, himself received baptism from the five Sikhs he had first initiated. The panth, the assembly and the Guru became one. After his demise, there was no living Guru for the Sikhs. The Shabad, in the presence of the sangat, became the Guru, the guiding light and in presence of Akalpurakh, the Timeless Being. The panth thus was invested with the personality of the Guru, and the incorporated Word became Gyan Guru (knowledge). This panth, called the Khalsa, was to be the Guru in spirit, and was authorised to work with collective responsibility, with Guru Granth Sahib as its guiding spirit.
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: CS1 maint: location missing publisher (link)The ten Gurus organised their disciples into sangats and infused their personality again into the Sikhs. This led to a remarkable development in the institution of 'Guru-ship', which eventually became the Guru Panth, thus bestowing divinity on the people. ... The Sikh assemblies also acquired great sanctity, owing to the belief that the spirit of the Guru lived and moved among them collectively, the whole body being called the panth. This panth follows the path shown by the way the Gurus lived their lives, as also the precepts laid down by them. In turn, it is regarded as an embodiment of the Guru—Guru Panth. In 1699, Guru Gobind Singh, the tenth Guru, himself received baptism from the five Sikhs he had first initiated. The panth, the assembly and the Guru became one. After his demise, there was no living Guru for the Sikhs. The Shabad, in the presence of the sangat, became the Guru, the guiding light and in presence of Akalpurakh, the Timeless Being. The panth thus was invested with the personality of the Guru, and the incorporated Word became Gyan Guru (knowledge). This panth, called the Khalsa, was to be the Guru in spirit, and was authorised to work with collective responsibility, with Guru Granth Sahib as its guiding spirit.
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: CS1 maint: location missing publisher (link)