A poison known as kālakūṭa will be generated from the Ocean of Milk, but you should not fear it. And when various products are churned from the ocean, you should not be greedy for them or anxious to obtain them, nor should you be angry.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
न भेतव्यं कालकूटाद्विषाज्जलधिसम्भवात् । लोभः कार्यो न वो जातु रोषः कामस्तु वस्तुषु
na bhetavyaṃ kālakūṭādviṣājjaladhisambhavāt | lobhaḥ kāryo na vo jātu roṣaḥ kāmastu vastuṣu
SB 8.6.25