The paper reports the direct observation of Weyl nodes in TaAs using bulk-sensitive soft X-ray angle-resolved photoemission spectroscopy (ARPES). Weyl nodes, predicted by H. Weyl in 1929, are pairs of massless Dirac fermions with opposite chirality that appear when two non-degenerate bands cross near the Fermi energy in three-dimensional momentum space. The study confirms the existence of Weyl fermionic quasiparticles in TaAs by identifying two pairs of Weyl nodes, labeled W1 and W2, in the 3D Brillouin zone. These nodes are located at specific points in the momentum space, and their projections onto the (001) surface match well with Fermi arcs observed in VUV ARPES experiments. The experimental results provide compelling evidence for the presence of Weyl fermions in TaAs, supporting the theoretical predictions and recent observations of exotic properties such as surface states with Fermi arcs and negative magneto-resistivity.The paper reports the direct observation of Weyl nodes in TaAs using bulk-sensitive soft X-ray angle-resolved photoemission spectroscopy (ARPES). Weyl nodes, predicted by H. Weyl in 1929, are pairs of massless Dirac fermions with opposite chirality that appear when two non-degenerate bands cross near the Fermi energy in three-dimensional momentum space. The study confirms the existence of Weyl fermionic quasiparticles in TaAs by identifying two pairs of Weyl nodes, labeled W1 and W2, in the 3D Brillouin zone. These nodes are located at specific points in the momentum space, and their projections onto the (001) surface match well with Fermi arcs observed in VUV ARPES experiments. The experimental results provide compelling evidence for the presence of Weyl fermions in TaAs, supporting the theoretical predictions and recent observations of exotic properties such as surface states with Fermi arcs and negative magneto-resistivity.