You cannot directly view deleted WhatsApp messages inside WhatsApp after they are removed
Check your phone’s notification history if it was enabled before the message was deleted
On Android, use notification log or notification history settings to see message previews
If you use a backup made before the deletion, restore WhatsApp from that backup to recover the message
Ask the sender to resend the message
Check linked devices if the message was visible there before deletion
Use third-party recovery or notification apps only if you trust them and understand the privacy risks
Keep regular backups enabled to increase the chance of recovering deleted messages