Welsh Government and the emergency services have signed a joint letter urging people to stay at home over the Easter weekend.
The letter, signed by the First Minister, Health Minister and the Chief Medical Officer, says lives will be saved by following the rules.
With sunny weather forecast for the bank holiday weekend, the fear is that people will flout the lockdown.
Mark Drakeford confirmed on Wednesday that the strict social distancing measures would continue for longer than the initial three weeks.
Alongside government ministers, the letter is also signed by representatives from the NHS, police and national park authorities.
The letter's key message is for people to "stay home and save lives" and is addressed "to the people of Wales."
Whilst acknowledging how difficult it can be to remain indoors, the letter says that it is vital we all do so "to protect the NHS."
Boris Johnson has also sent a letter to UK households, urging them to comply with the lockdown.
This comes in the same week that Wales became the first nation in the UK to make it illegal for employers not to ensure their staff work at least two metres apart from each other.
On Wednesday 8, it was confirmed that 33 more people in Wales had lost their lives to coronavirus.
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