Whoever sets a bad precedent will bear the burden of sin of those who do it until the Day of Resurrection
Question: “If a person dies, and leaves behind bad deeds and bad things, will these bad things accumulate?…”
If a person dies having done actions that were contrary to Islam, and others such as children, friends, neighbours and so on, followed his example, then he bears the burden (of sin) of what he did and the burden of those who did the same, following his example, without that detracting from their burden of sin in the slightest.
Muslim (1017) narrated that Jareer ibn ‘Abd-Allah (may Allah be pleased with him) said: The Messenger of Allah (sa) said: “Whoever sets a good precedent in Islam will have the reward for that and the reward of those who do it after him, without that detracting from their reward in the slightest. And whoever sets a bad precedent in Islam will bear the burden of sin for that, and the burden of those who do it after him, without that detracting from their burden in the slightest.”
Shaykh Ibn ‘Uthaymeen said:
This is a warning against setting a bad precedent, and shows us that whoever sets a bad precedent will bear the burden of sin for that and the burden of those who do it, until the Day of Resurrection, even if it was on a small scale at first, then it became more widespread; he will bear the burden of its spreading.
It was narrated that Ibn Mas‘ood (may Allah be pleased with him) said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “No soul is killed unlawfully, but there is a share of the sin on the first son of Adam, because he was the first one to set the precedent of killing.”
This hadeeth (The Prophet sallallaahu alayhi wasallam) “Each of you is a shepherd and each of you is responsible for his flock. …) represents one of the basic principles of Islam, which is that anyone who introduces any kind of evil will bear the burden of sin of everyone who follows his example in doing that until the Day of Resurrection.
For more reading: http://islamqa.com/en/ref/128686