ਅੰਡਜ ਜੇਰਜ ਉਤਭੁਜ ਸੇਤਜ ਤੇਰੇ ਕੀਤੇ ਜੰਤਾ ॥
ਏਕੁ ਪੁਰਬੁ ਮੈ ਤੇਰਾ ਦੇਖਿਆ ਤੂ ਸਭਨਾ ਮਾਹਿ ਰਵੰਤਾ ॥੩॥
The beings born of eggs, born of the womb, born of the earth and born of sweat, all are created by You.
I have seen one glory of Yours, that You are pervading and permeating in all. ||3|| - 596/15 - Guru Nanak Dev
The blog contain textual material from Guru Granth Sahib, Historical Books of Sikhism and Lecture of Sikhs on said topic.
Guru Angad Dev ji took Goat Meat on meeting Guru Amar Dass - Mahima Parkash
Following lines from the source mentioned tells about meeting of Guru Amar Dass, A Vegie Vaishnav Saint, when went to meet Guru Angat Dev. He amazed at this fact that Guru Angad Dev ji took Animal Food. Though Vaishnavite, he felt uncomfortable while sitting for Lunch with Guru Angad Dev, as in LANGAR Goat meat was prepared. When their Sewadar served food, Guru Angad Dev Said don't give goat meat to Guru Amardas and serve him Daal only. Guru Angad Dev haven't forced Guru Amar Das to eat and he had no problem in taking any kind of food.