WhatsApp has started Swipe to Reply feature which allows users to quickly reply to a text with a gesture.
The feature will allow users to swipe on a message that one wants to reply to towards the right side
Whatsapp: Swipe to Reply feature
1- Open WhatsApp on any chat.
2- Simply tap on the message you’re looking to reply to directly and slide your finger from left to right.
3- And WhatsApp will automatically load the message in the reply context.
4- From there, the original message you referenced will appear in the lower part of your screen. Then type your reply and hit the send button to send it on.
Notes: Ensure that you are running the latest version of WhatsApp available via the Google Play Store.