Do you want to resend a message to another recipient? You can do this with WhatsApp and you won't need to rewrite said message again when you want to send it to the other contact. Just copy and paste it to resend and save time.
Steps
Method 1 of 2: Copy and paste messages on WhatsApp using iPhone or iPad

Step 1. Open the WhatsApp application
The app icon looks like a green bubble around a white phone handset.

Step 2. Tap a chat
This action will allow you to open the discussion in full screen.

Step 3. Press and hold a conversation message
This will highlight it and open a context menu with several options, including To respond and To transfer.

Step 4. Press the button represented by a right arrow
It is located in the contextual menu and will allow you to display more options in this menu.

Step 5. Tap Copy
This will allow you to copy the highlighted message to the clipboard.

Step 6. Press and hold the text field
The text field is at the bottom of your screen where you write messages before sending them. A pop-up window (to stick on) will appear and allow you to paste your message.

Step 7. Tap Paste
Your message will be pasted into the text field.

Step 8. Press the send button
This button looks like a green and white icon represented by a paper airplane. It is located on the right side of the text box. Tap on it to send your message.
Method 2 of 2: Copy and paste messages on WhatsApp using an Android

Step 1. Open the WhatsApp application
The app icon looks like a green bubble around a white phone handset.

Step 2. Tap a chat
This action will allow you to open the discussion in full screen.

Step 3. Press and hold a message from a conversation
This will highlight it.

Step 4. Tap the icon that will allow you to copy the message
This icon is located in the toolbar of your screen and looks like two rectangles with one (vertical) behind the other. Located at the top of the screen, the to stick on represents the second icon counting from the right on the toolbar next to the one that represents Following. It will allow you to copy the highlighted message to the clipboard.

Step 5. Press and hold the text box
A pop-up window (to stick on) will appear and allow you to paste the message.

Step 6. Tap Paste
Your message will be pasted into the text box.
When you copy multiple messages at once, you also copy the timestamp of each message. If so, delete it manually after pasting the text

Step 7. Press the send button
This button looks like a green and white icon represented by a paper airplane. It is located on the right side of the text box. Tap it to send your message to the recipient.