According to Valmiki Ramayan, Kaal came disguised as a sage to meet Ram. He put a condition that no body should enter that room so long Kaal was there or else, he (i.e. the intruder) should be given death punishment. Ram trusted his brother Laxman much more than the security person at the door. Therefore, Ram called Laxman and asked him to stand at the door instead of that security person. He also said that nobody should be allowed to enter that room or else the intruder would be given death punishment.
Laxman did the same.
Sage Durvasa came and wanted to meet Ram. Remebering Ram's orders, Laxman requested Durvasa to wait. Durvasa got angry and threatened that he would curse the entire family of Laxman. Laxman thought, "It is better for me to get death punishment than so many people getting cursed." He went inside and informed Ram about Durvasa's arrival. By that time, Kaal had finished talking to Ram. Ram asked Laxman to bring Durvasa with respect. Kaal left and Durvasa entered. Ram provided hospitality to Durvasa. Durvasa went satisfied. Then Ram was very sad because he had to give death punishment to his dear brother Laxman. Vashishth and other sages suggested to Ram than banishing Laxman would be equivalent to death for him. Laxman heard this. Without saying anything to anybody and without even meeting anybody, he went to river and entered it. Lord Indra came to take him.
Illustration
http://www.speakingtree.in/spiritual-slideshow/seekers/god-and-i/when-rama-had-to-sentence-lakshmana-to-death/87270
Departure of all Brothers
http://www.astrojyoti.com/ramayanavalmikuttarakanda7-6.htm
Sage Durvasa came and wanted to meet Ram. Remebering Ram's orders, Laxman requested Durvasa to wait. Durvasa got angry and threatened that he would curse the entire family of Laxman. Laxman thought, "It is better for me to get death punishment than so many people getting cursed." He went inside and informed Ram about Durvasa's arrival. By that time, Kaal had finished talking to Ram. Ram asked Laxman to bring Durvasa with respect. Kaal left and Durvasa entered. Ram provided hospitality to Durvasa. Durvasa went satisfied. Then Ram was very sad because he had to give death punishment to his dear brother Laxman. Vashishth and other sages suggested to Ram than banishing Laxman would be equivalent to death for him. Laxman heard this. Without saying anything to anybody and without even meeting anybody, he went to river and entered it. Lord Indra came to take him.
Illustration
http://www.speakingtree.in/spiritual-slideshow/seekers/god-and-i/when-rama-had-to-sentence-lakshmana-to-death/87270
Departure of all Brothers
http://www.astrojyoti.com/ramayanavalmikuttarakanda7-6.htm
