Ghast Tear is a rare drop obtained when a player kills a Ghast, a large, floating, ghost-like mob that inhabits the Nether. This item is used in brewing to create potions of Regeneration, which heal the player over time. Additionally, it can be used as a crafting ingredient for the creation of End Crystals, essential for respawning the Ender Dragon, a boss creature in the End dimension.
The numerical item ID for Ghast Tear is 370
Numerical item IDs will only work in Minecraft versions below 1.13.
The item ID for Ghast Tear is minecraft:ghast_tear
This is the spawn command to give yourself Ghast Tear in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give